KT-1378 Code formatting: spaces around ':'

Changed test data to match actual behavior of the "override methods" feature.

idea/testData/codeInsight/overrideImplement/javaInterfaceMethod/foo/Impl.kt.after

@@ -2,7 +2,7 @@ import foo.Intf
 
 class Impl(): Intf {
 
-    override fun getFooBar(): String? {
+    override fun getFooBar() : String? {
         throw UnsupportedOperationException()
     }
 }