Don't set dirty bit when adding MARKERs.

They're not saved in the file, so they shouldn't dirty it.

Fixes: lp:1762497
* https://bugs.launchpad.net/kicad/+bug/1762497

include/commit.h

@@ -130,7 +130,8 @@ public:
     COMMIT& Stage( const PICKED_ITEMS_LIST& aItems, UNDO_REDO_T aModFlag = UR_UNSPECIFIED );
 
     ///> Executes the changes.
-    virtual void Push( const wxString& aMessage = wxT( "A commit" ), bool aCreateUndoEntry = true ) = 0;
+    virtual void Push( const wxString& aMessage = wxT( "A commit" ),
+                       bool aCreateUndoEntry = true, bool aSetDirtyBit = true ) = 0;
 
     ///> Revertes the commit by restoring the modifed items state.
     virtual void Revert() = 0;