Fix problem where using key combination for copy closes map display. Ctrl-C, Ctrl-X, and Ctrl-V need to be reserved for copy, cut, and paste. Backport from develbranch_6 r39710.

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@39712 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/xml/menudata.xml

@@ -33,7 +33,6 @@
 	      <label>Close</label>
 	      <help>Close workspace file</help>
 	      <handler>self.OnWorkspaceClose</handler>
-	      <shortcut>Ctrl+C</shortcut>
 	    </menuitem>
 	    <separator />
 	    <menuitem>