add -p: fix worktree patch mode prompts

cee6cb7 (built-in add -p: implement the "worktree" patch modes,
2019-12-21) added the worktree patch modes to the built-in add -p.
Its commit message claims to be a port of 2f0896e (restore:
support --patch, 2019-04-25), which did the same for the script
git-add--interactive.perl.

The script mentioned only the worktree in its prompt messages in
worktree mode, while the built-in mentions the worktree and also the
index, even though the command doesn't actually affect the index.

2c8bd84 (checkout -p: handle new files correctly, 2020-05-27)
added new prompt messages for addition that also mention the index in
worktree mode in the built-in, but not in the script.

Correct these prompts to state that only the worktree will be affected.

Reported-by: David Plumpton <[email protected]>
Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

add-patch.c

@@ -191,10 +191,10 @@ static struct patch_mode patch_mode_worktree_head = {
 	.apply_check_args = { "-R", NULL },
 	.is_reverse = 1,
 	.prompt_mode = {
-		N_("Discard mode change from index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Discard deletion from index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Discard addition from index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Discard this hunk from index and worktree [y,n,q,a,d%s,?]? "),
+		N_("Discard mode change from worktree [y,n,q,a,d%s,?]? "),
+		N_("Discard deletion from worktree [y,n,q,a,d%s,?]? "),
+		N_("Discard addition from worktree [y,n,q,a,d%s,?]? "),
+		N_("Discard this hunk from worktree [y,n,q,a,d%s,?]? "),
 	},
 	.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
 			     "will immediately be marked for discarding."),
@@ -213,10 +213,10 @@ static struct patch_mode patch_mode_worktree_nothead = {
 	.apply_args = { NULL },
 	.apply_check_args = { NULL },
 	.prompt_mode = {
-		N_("Apply mode change to index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Apply deletion to index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Apply addition to index and worktree [y,n,q,a,d%s,?]? "),
-		N_("Apply this hunk to index and worktree [y,n,q,a,d%s,?]? "),
+		N_("Apply mode change to worktree [y,n,q,a,d%s,?]? "),
+		N_("Apply deletion to worktree [y,n,q,a,d%s,?]? "),
+		N_("Apply addition to worktree [y,n,q,a,d%s,?]? "),
+		N_("Apply this hunk to worktree [y,n,q,a,d%s,?]? "),
 	},
 	.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
 			     "will immediately be marked for applying."),