Remove replacing spaces with %20 when encoding URL params

This appears to be handled by stringByAddingPercentEscapesUsingEncoding
and so explicitly doing it causes a space to be encoded to %2520 instead
of %20

native/atom_window_controller.mm

@@ -90,7 +90,6 @@
 }
 
 - (NSString *)encodeUrlParam:(NSString *)param {
-  param = [param stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
   param = [param stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
   param = [param stringByReplacingOccurrencesOfString:@"&" withString:@"%26"];
   return param;