QmlDesigner: Add line endings to source

The line-endings have to be correct, because
the rewriter only fixes the indentation.

Change-Id: If08f3b1bff8f35d63ee51521e6b07c7017fa3cf0
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/connectioneditor/connectioneditorstatements.cpp

@@ -229,10 +229,10 @@ struct JSOverload
             value += JSOverload()(conditional.ok);
 
         if (!isEmptyStatement(conditional.ko)) {
-            value += "} else {\n";
+            value += "\n} else {\n";
             value += JSOverload()(conditional.ko);
         }
-        value += "}";
+        value += "\n}";
 
         return value;
     }