completion: use __gitcomp_builtin in _git_cherry

Signed-off-by: Nguyễn Thái Ngọc Duy <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pclouds

contrib/completion/git-completion.bash

@@ -1286,6 +1286,12 @@ _git_checkout ()
 
 _git_cherry ()
 {
+	case "$cur" in
+	--*)
+		__gitcomp_builtin cherry
+		return
+	esac
+
 	__git_complete_refs
 }