cleanup: Remove unused clapperVersion variable

src/misc.js

@@ -11,7 +11,6 @@ var subsMimes = [
 ];
 
 var clapperPath = null;
-var clapperVersion = null;
 
 var settings = new Gio.Settings({
     schema_id: appId,
@@ -40,15 +39,6 @@ function getClapperPath()
         : '.';
 }
 
-function getClapperVersion()
-{
-    return (clapperVersion)
-        ? clapperVersion
-        : (pkg)
-        ? pkg.version
-        : '';
-}
-
 function getClapperThemeIconUri()
 {
     const display = Gdk.Display.get_default();