Ask before reloading file changed with external editor

To be consistent with other ways of starting external editors.

Change-Id: Ia6f8d2179076482999ef527353feb91a49e1a2d9
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/share/qtcreator/externaltools/notepad_win.xml

@@ -30,7 +30,7 @@
     <description>Opens the current file in Notepad</description>
     <displayname>Edit with Notepad</displayname>
     <category>Text</category>
-    <executable modifiesdocument="yes">
+    <executable>
         <path>notepad</path>
         <arguments>"%{CurrentDocument:FilePath}"</arguments>
         <workingdirectory>%{CurrentDocument:Path}</workingdirectory>

src/share/qtcreator/externaltools/vi.xml

@@ -30,7 +30,7 @@
     <description>Opens the current file in vi</description>
     <displayname>Edit with vi</displayname>
     <category>Text</category>
-    <executable modifiesdocument="yes">
+    <executable>
         <path>xterm</path>
         <arguments>-geom %{CurrentDocument:ColumnCount}x%{CurrentDocument:RowCount}+%{CurrentDocument:XPos}+%{CurrentDocument:YPos} -e vi "%{CurrentDocument:FilePath}" +%{CurrentDocument:Row}</arguments>
         <workingdirectory>%{CurrentDocument:Path}</workingdirectory>

src/share/qtcreator/externaltools/vi_mac.xml

@@ -30,7 +30,7 @@
     <description>Opens the current file in vi</description>
     <displayname>Edit with vi</displayname>
     <category>Text</category>
-    <executable modifiesdocument="yes">
+    <executable>
         <path>osascript</path>
         <input>
         --Terminal opens a window by default when it is not running, so check