Fixes rock sprites ingame [WHOOPS] (shiptest-ss13#2332)

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## About The Pull Request
Rocks were invisible in game due to a recently merged PR of mine. this
is why we testmerge PRs! anyways this should fix them.

Adds flora and rock missing texture sprites to most flora files to
prevent something like this from ever happening again.
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## Why It's Good For The Game
invisible things that block movement bad yeah. i want to fix my
mistakes.
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## Changelog

:cl:
fix: Most rocks are now visible again
add: Most flora files now have missing texture sprites to make it easier
to spot when something has gone wrong.
/:cl:

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code/game/objects/structures/flora.dm

@@ -415,7 +415,8 @@
 //and now these defines
 
 /obj/structure/flora/rock
-	icon_state = "basalt"
+	icon_state = "basalt1"
+	base_icon_state = "basalt"
 	desc = "A volcanic rock. Pioneers used to ride these babies for miles."
 	icon = 'icons/obj/flora/rocks.dmi'
 	resistance_flags = FIRE_PROOF
@@ -450,7 +451,8 @@
 			playsound(src.loc, 'sound/items/welder.ogg', 100, TRUE)
 
 /obj/structure/flora/rock/pile
-	icon_state = "lavarocks"
+	icon_state = "lavarocks1"
+	base_icon_state = "lavarocks"
 	desc = "A pile of rocks."
 
 //Jungle grass
@@ -472,14 +474,15 @@
 //Jungle rocks
 
 /obj/structure/flora/rock/jungle
-	icon_state = "rock"
+	icon_state = "rock1"
+	base_icon_state = "rock"
 	desc = "A pile of rocks."
 	icon = 'icons/obj/flora/jungleflora.dmi'
 	density = FALSE
 
 /obj/structure/flora/rock/jungle/Initialize()
 	. = ..()
-	icon_state = "[initial(icon_state)][rand(1,5)]"
+	icon_state = "[base_icon_state][rand(1,5)]"
 
 
 //Jungle bushes
@@ -489,9 +492,10 @@
 	desc = "A wild plant that is found in jungles."
 	icon = 'icons/obj/flora/jungleflora.dmi'
 	icon_state = "busha"
+	base_icon_state = "bush"
 
 /obj/structure/flora/junglebush/Initialize()
-	icon_state = "[icon_state][rand(1, 3)]"
+	icon_state = "[base_icon_state][rand(1, 3)]"
 	. = ..()
 
 /obj/structure/flora/junglebush/b
@@ -816,7 +820,8 @@
 	name = "lavatic rock"
 	desc = "A volcanic rock. Lava is gushing from it. "
 	icon = 'icons/obj/flora/lavarocks.dmi'
-	icon_state = "basalt"
+	icon_state = "basalt1"
+	base_icon_state = "basalt"
 	light_color = "#ab4907"
 	light_power = 3
 	light_range = 2
@@ -825,7 +830,8 @@
 	name = "rock shards"
 	desc = "Jagged shards of volcanic rock protuding from the ground."
 	icon = 'icons/obj/flora/lavarocks.dmi'
-	icon_state = "lavarocks"
+	icon_state = "lavarocks1"
+	base_icon_state = "lavarocks"
 	gender = PLURAL
 
 /obj/structure/flora/rock/asteroid
@@ -890,13 +896,15 @@
 /obj/structure/flora/rock/hell
 	name = "rock"
 	desc = "A volcanic rock, one of the few familiar things on this planet."
-	icon_state = "basalt"
+	icon_state = "basalt1"
+	base_icon_state = "basalt"
 	icon = 'icons/obj/flora/rocks.dmi'
 
 /obj/structure/flora/rock/beach
 	name = "sea stack"
 	desc = "A column of rock, formed by wave erosion."
-	icon_state = "basalt"
+	icon_state = "basalt1"
+	base_icon_state = "basalt"
 	icon = 'icons/obj/flora/rocks.dmi'
 
 /obj/structure/flora/tree/dead/barren