Make the default workspace commands compatible with i3

**Problem**

When I rename the workspace to something like "1:web",
`$mod+1` does not move to the "1:web" with the default config. This breaks
the expectation of i3 users.

**Cause**

The default Sway binding for `$mod+1` does not have the number
keyword:

```
bindsym $mod+1 workspace 1
```

Instead, the default Sway binding for `$mod+1` is

```
bindsym Mod1+1 workspace number $ws1
```

i3/i3@e6662df
is the corresponding commit from i3.

(cherry picked from commit 585236f)

config.in

@@ -112,27 +112,27 @@ output * bg @datadir@/backgrounds/sway/Sway_Wallpaper_Blue_1920x1080.png fill
 # Workspaces:
 #
     # Switch to workspace
-    bindsym $mod+1 workspace 1
-    bindsym $mod+2 workspace 2
-    bindsym $mod+3 workspace 3
-    bindsym $mod+4 workspace 4
-    bindsym $mod+5 workspace 5
-    bindsym $mod+6 workspace 6
-    bindsym $mod+7 workspace 7
-    bindsym $mod+8 workspace 8
-    bindsym $mod+9 workspace 9
-    bindsym $mod+0 workspace 10
+    bindsym $mod+1 workspace number 1
+    bindsym $mod+2 workspace number 2
+    bindsym $mod+3 workspace number 3
+    bindsym $mod+4 workspace number 4
+    bindsym $mod+5 workspace number 5
+    bindsym $mod+6 workspace number 6
+    bindsym $mod+7 workspace number 7
+    bindsym $mod+8 workspace number 8
+    bindsym $mod+9 workspace number 9
+    bindsym $mod+0 workspace number 10
     # Move focused container to workspace
-    bindsym $mod+Shift+1 move container to workspace 1
-    bindsym $mod+Shift+2 move container to workspace 2
-    bindsym $mod+Shift+3 move container to workspace 3
-    bindsym $mod+Shift+4 move container to workspace 4
-    bindsym $mod+Shift+5 move container to workspace 5
-    bindsym $mod+Shift+6 move container to workspace 6
-    bindsym $mod+Shift+7 move container to workspace 7
-    bindsym $mod+Shift+8 move container to workspace 8
-    bindsym $mod+Shift+9 move container to workspace 9
-    bindsym $mod+Shift+0 move container to workspace 10
+    bindsym $mod+Shift+1 move container to workspace number 1
+    bindsym $mod+Shift+2 move container to workspace number 2
+    bindsym $mod+Shift+3 move container to workspace number 3
+    bindsym $mod+Shift+4 move container to workspace number 4
+    bindsym $mod+Shift+5 move container to workspace number 5
+    bindsym $mod+Shift+6 move container to workspace number 6
+    bindsym $mod+Shift+7 move container to workspace number 7
+    bindsym $mod+Shift+8 move container to workspace number 8
+    bindsym $mod+Shift+9 move container to workspace number 9
+    bindsym $mod+Shift+0 move container to workspace number 10
     # Note: workspaces can have any name you want, not just numbers.
     # We just use 1-10 as the default.
 #