gitk patch to not show date in 'copy reference'

gitk-copy-ref.patch

commit 61e26f68cb15f6753936f66766149dd738f8b1ac
Author: Mark Mossberg
Date:   Wed Jan 5 12:22:19 2022 +0100

    gitk: Don't copy date with commit reference

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 23d9dd1..e70c42a 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -9447,8 +9447,8 @@ proc mktaggo {} {
 proc copyreference {} {
     global rowmenuid autosellen
 
-    set format "%h (\"%s\", %ad)"
-    set cmd [list git show -s --pretty=format:$format --date=short]
+    set format "%h (\"%s\")"
+    set cmd [list git show -s --pretty=format:$format]
     if {$autosellen < 40} {
         lappend cmd --abbrev=$autosellen
     }