fix PHP 8.0 error ("" < -1) as there is no automatic cast anymore Syn…

[ralfbecker]

…cObject->Check(): Unmet condition in object from type SyncProvisioning: parameter maxattsize is LOWER than -1. Check failed!

Released under the GNU Affero General Public License (AGPL), version 3

What does this implement/fix? Explain your changes.

It restores the previous PHP versions behavior, that ("" < -1) === false, by an explicit cast to (float)

Does this close any currently open issues?

...

Any relevant logs, error output, etc?

Unmet condition in object from type SyncProvisioning: parameter maxattsize is LOWER than -1. Check failed!

Where has this been tested?

Server (please complete the following information):

• OS: iOS and Android
• PHP Version: 8.4
• Backend for: EGroupware using diffbackend
• and Version: Z-Push version 2.5.0

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Mail App [e.g. GMail, Apple Mail]
• Version [e.g. 22]

[matidau]

Thanks 🙂