style: prettier the validator change

CI's Frontend Check (format) flagged tests/validate-register.js. Pure reflow —
the multi-line if collapses to one line under @nextcloud/prettier-config. The
heuristic is re-verified after the reformat, in both directions: the register
passes clean, a genuine stub still warns.

Author: Conduction Release Bot

tests/validate-register.js

@@ -205,11 +205,7 @@ function validateRegister(file, errors, warnings) {
 			xKeys.filter((k) => k !== 'x-openregister-seed').length > 0
 			|| (s.authorization && typeof s.authorization === 'object'),
 		)
-		if (
-			props.length > 0
-			&& props.length <= 3
-			&& declaresSomething === false
-		) {
+		if (props.length > 0 && props.length <= 3 && declaresSomething === false) {
 			warnings.push(
 				`${at}: only ${props.length} properties and no x-openregister-* declarations — verify this isn't a stub left by a bad merge`,
 			)