- `LoadDefinitions()`: Remove if statement added in 1ea25e5d0e that was causing added DEF files not to load.

* The loop for `userConfig.AddDefs` feels like it should be moved out of `loaddefinitionsfile()` and into `LoadDefinitions()`, but that's subject to discussion.

source/core/gamecontrol.cpp

@@ -1367,7 +1367,7 @@ void LoadDefinitions()
 			loaddefinitionsfile(razedefsfile, true, true);
 			loaded = razedefsfile;
 		}
-		else if (fileSystem.FileExists(defsfile))
+		else
 		{
 			loaddefinitionsfile(defsfile, true, false);
 			loaded = defsfile;