wl: no keyboard grab while inactive

An activate and a deactivate in one batch left the grab taken with nothing
active, which is the one state the grab must never be in: sway hands keys
to the grab holder without asking whether the input method is active.
sway cannot produce that batch -- relay_send_im_state sends a done after
each -- so this is the table being total, not a bug that bit.  The
deactivate arm was already right; only the activate arm forgot to look at
where the batch ended.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

wl.c

@@ -439,7 +439,7 @@ imdone(void*, struct zwp_input_method_v2*)
 		leave();
 	else if(active && !washidden && hidden())
 		flushpending();
-	if(activated)
+	if(activated && pendingactive)
 		grabkeyboard();
 	else if(!pendingactive)
 		releasegrab();