[cfg-breaking] Rename hide-on-key-press to hide-when-typing

I originally preferred on-key-press, but when-typing feels more natural
and matches sway. This setting had not been in a stable release yet so
this is not stable release cfg breaking.

wiki/Configuration:-Miscellaneous.md

@@ -21,7 +21,7 @@ cursor {
     xcursor-theme "breeze_cursors"
     xcursor-size 48
 
-    hide-on-key-press
+    hide-when-typing
     hide-after-inactive-ms 1000
 }
 
@@ -109,7 +109,7 @@ cursor {
 }
 ```
 
-#### `hide-on-key-press`
+#### `hide-when-typing`
 
 <sup>Since: 0.1.10</sup>
 
@@ -117,7 +117,7 @@ If set, hides the cursor when pressing a key on the keyboard.
 
 ```kdl
 cursor {
-    hide-on-key-press
+    hide-when-typing
 }
 ```