DiffEditor: Modernize

modernize-use-auto
modernize-use-override
modernize-use-equals-default

Change-Id: I4e70550ed2962781b62661a405517b5c79126bad
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/diffutils.h

@@ -47,7 +47,7 @@ public:
         PatchEditor
     };
 
-    DiffFileInfo() {}
+    DiffFileInfo() = default;
     DiffFileInfo(const QString &file) : fileName(file) {}
     DiffFileInfo(const QString &file, const QString &type)
         : fileName(file), typeInfo(type) {}