Add button GUI sound

mods/default/README.txt

@@ -19,6 +19,10 @@ Sound licenses:
   * default_tool_breaks.ogg:
     * Source: https://freesound.org/people/JustInvoke/sounds/446118/
     * Author: JustInvoke (CC BY 3.0)
+  * default_gui_button.ogg:
+    * Source: https://freesound.org/people/joedeshon/sounds/117413/
+    * Sound was changed!
+    * Author: joedeshon (CC BY 3.0)
   * All other sounds: CC0
 Texture license: CC BY-SA 4.0
 Model license: CC BY-SA 4.0

mods/default/formspec.lua

@@ -17,7 +17,8 @@ default.ui.current_page = {}
 -- Colors
 
 local prepend = "listcolors[#00000000;#00000010;#00000000;#68B259;#FFF]" ..
-    "tableoptions[background=#DDDDDD30;highlight=#539646]"
+    "tableoptions[background=#DDDDDD30;highlight=#539646]" ..
+    "style_type[button,image_button,checkbox,tabheader;sound=default_gui_button]"
 default.ui.default.bg = "bgcolor[#00000000]"
 
 -- bgcolor intentionally not included because it would make pause menu transparent, too :(