SIP dialout/direct dialin only works if dial-in information is provided

[SystemKeeper]

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Steps to reproduce

1. Enable SIP Dial-out in the settings, but leave dial-in information empty

Expected behaviour

Dial out should work

Actual behaviour

Dial out is greyed out "SIP backend is not installed"

Talk app

Talk app version: main

[Antreesy]

spreed/lib/Config.php

Lines 115 to 118 in 36aca13

	public function isSIPConfigured(): bool {
	return $this->getSIPSharedSecret() !== ''
	&& $this->getDialInInfo() !== '';
	}

[SystemKeeper]

Just to add it, this also affects direct dial in, as that checks the same config.