Revert "wpaint.js: prevent submission on color change"

This reverts commit 3a97ff1a7e.

js/wpaint.js

@@ -86,8 +86,6 @@ oekaki.init = function() {
         alsoResize: "#wpaintdiv, #wpaintdiv canvas",
       });
 
-
-      $("#wpaintdiv input").on("keydown", function(e) { if (e.keycode == 13) e.preventDefault(); });
       $('#wpaintctr .ui-resizable-se').css({'height':'12px', 'width':'12px'});
     }
   });