fix: #10502, allow unblocking admin/mod

if they were blocked before becoming admin/mod it wasn't possible to unblock them

src/socket.io/user/profile.js

@@ -45,11 +45,8 @@ module.exports = function (SocketUser) {
 	};
 
 	SocketUser.toggleBlock = async function (socket, data) {
-		const [is] = await Promise.all([
-			user.blocks.is(data.blockeeUid, data.blockerUid),
-			user.blocks.can(socket.uid, data.blockerUid, data.blockeeUid),
-		]);
-		const isBlocked = is;
+		const isBlocked = await user.blocks.is(data.blockeeUid, data.blockerUid);
+		await user.blocks.can(socket.uid, data.blockerUid, data.blockeeUid, isBlocked ? 'unblock' : 'block');
 		await user.blocks[isBlocked ? 'remove' : 'add'](data.blockeeUid, data.blockerUid);
 		return !isBlocked;
 	};

src/user/blocks.js

@@ -22,7 +22,7 @@ module.exports = function (User) {
 		return isArray ? isBlocked : isBlocked[0];
 	};
 
-	User.blocks.can = async function (callerUid, blockerUid, blockeeUid) {
+	User.blocks.can = async function (callerUid, blockerUid, blockeeUid, type) {
 		// Guests can't block
 		if (blockerUid === 0 || blockeeUid === 0) {
 			throw new Error('[[error:cannot-block-guest]]');
@@ -36,7 +36,7 @@ module.exports = function (User) {
 			User.isAdminOrGlobalMod(callerUid),
 			User.isAdminOrGlobalMod(blockeeUid),
 		]);
-		if (isBlockeeAdminOrMod) {
+		if (isBlockeeAdminOrMod && type === 'block') {
 			throw new Error('[[error:cannot-block-privileged]]');
 		}
 		if (parseInt(callerUid, 10) !== parseInt(blockerUid, 10) && !isCallerAdminOrMod) {