sane-input-handler: fix toggleKeyboard improperly calling effect

'cant call proc when errexit is set...' this seems like a genuine limitation of osh

hosts/common/programs/sane-input-handler/sane-input-handler

@@ -331,7 +331,10 @@ proc toggleKeyboard {
     # `env` so that we get the right `kill` binary instead of bash's builtin
     # `kill` only one keyboard process. in the case of e.g. sandboxing,
     # the keyboard might consist of multiple processes and each one we signal would cause a toggle
-    if effect env kill -s RTMIN+0 "$p" {
+    try {
+      effect env kill -s RTMIN+0 "$p"
+    }
+    if ! failed {
       break
     }
   }