qt: Fix missing qRegisterMetaType for size_t
qt: Fix missing qRegisterMetaType for size_t

It is required in order to use size_t in QueuedConnections.

Github-Pull: #17427
Rebased-From: 88a94f7bb8ba2b0257315d70717f9af928ca6561
Tree-SHA512: 55accd997209c559dfc8e88b0db189ba314ac31e265ba2f94fa2009f1aba6b96213e2aa8cbad492b1230078f2e6cf1cca7a233dc6f54e9bc449f4e5438330b4d

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