PythonEditor: Code cosmetics

Namespace, unused members.

Change-Id: I5cad3a42843c716c5f06bd481c1a1b7b8a2cf29d
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/pythoneditor/pythoneditor.cpp

@@ -35,6 +35,8 @@
 
 #include <utils/qtcassert.h>
 
+#include <QCoreApplication>
+
 using namespace TextEditor;
 
 namespace PythonEditor {