Use VS Project icons

Context: #8883 (comment)

Opinion was that the icons for Classic Xamarin.Android within VS 17.9
were better than the icons added in this PR.

Update the *project* templates to use the older icons.

*Item* templates are unchanged, and use the new icon.

Author: jonpryor

src/Microsoft.Android.Templates/android-bindinglib/.template.config/ide.host.json

@@ -1,6 +1,6 @@
 {
     "$schema": "http://json.schemastore.org/ide.host",
-    "icon": "ide/icon.png",
+    "icon": "ide/icon.ico",
     "appliesTo": "Android",
     "defaultItemExtension": "cs",
     "itemHierarchyPaths": [ "Android" ]

src/Microsoft.Android.Templates/android-bindinglib/.template.config/ide/icon.ico

@@ -1,6 +1,6 @@
 {
     "$schema": "http://json.schemastore.org/ide.host",
-    "icon": "ide/icon.png",
+    "icon": "ide/icon.ico",
     "appliesTo": "Android",
     "defaultItemExtension": "cs",
     "itemHierarchyPaths": [ "Android" ]

src/Microsoft.Android.Templates/android-bindinglib/.template.config/ide/icon.png

@@ -1,6 +1,6 @@
 {
     "$schema": "http://json.schemastore.org/ide.host",
-    "icon": "ide/icon.png",
+    "icon": "ide/icon.ico",
     "appliesTo": "Android",
     "defaultItemExtension": "cs",
     "itemHierarchyPaths": [ "Android" ]

src/Microsoft.Android.Templates/android-wear/.template.config/ide.host.json

@@ -1,6 +1,6 @@
 {
     "$schema": "http://json.schemastore.org/ide.host",
-    "icon": "ide/icon.png",
+    "icon": "ide/icon.ico",
     "appliesTo": "Android",
     "defaultItemExtension": "cs",
     "itemHierarchyPaths": [ "Android" ]