completion: complete refs after 'git restore -s'

Currently only the long version (--source=) supports completion.

Add completion support to the short (-s) option too.

Signed-off-by: Ákos Uzonyi <uzonyi.akos@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 3d02bd4..0a96ad8 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2841,6 +2841,13 @@
 
 _git_restore ()
 {
+	case "$prev" in
+	-s)
+		__git_complete_refs
+		return
+		;;
+	esac
+
 	case "$cur" in
 	--conflict=*)
 		__gitcomp "diff3 merge" "" "${cur##--conflict=}"