[processing] Fix script editor dialog title

Author: nyalldawson

python/plugins/processing/ui/DlgScriptEditor.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Script editor</string>
+   <string>Processing Script Editor</string>
   </property>
   <widget class="QWidget" name="centralwidget">
    <layout class="QGridLayout" name="gridLayout">