fix: reverse quotes for variable expansion

Without reversing quotes, the variables are sometimes improperly expanded, resulting in files not being removed.

plugins/ssh-keys/subcommands/add

@@ -11,7 +11,7 @@ add_keys() {
   declare NAME="$1" KEY_FILE="$2"
   local TMP_KEY_FILE
   TMP_KEY_FILE=$(mktemp "/tmp/${FUNCNAME[0]}.XXXX")
-  trap 'rm -rf "$TMP_KEY_FILE" >/dev/null' RETURN INT TERM EXIT
+  trap "rm -rf '$TMP_KEY_FILE' >/dev/null" RETURN INT TERM EXIT
 
   if [[ -n "$KEY_FILE" ]]; then
     true