TextEditor: C++-ify texteditoractionhandler

Macros are not necessary here.

Change-Id: I19e5c38e64f1b7f254c1fcb33d891e02704e3657
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/texteditor/basetexteditor.h

@@ -412,8 +412,8 @@ public slots:
     void circularPaste();
     void switchUtf8bom();
 
-    void zoomIn(int range = 1);
-    void zoomOut(int range = 1);
+    void zoomIn();
+    void zoomOut();
     void zoomReset();
 
     void cutLine();