UI: Untangle ifdef'd if-statement to un-confuse Xcode

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Like many IDEs, Xcode has this feature where it shows the declaration of
the method currently being worked in. However it gets confused by scopes
starting inside of preprocessor guards and ending outside them,
resulting in the declaration of OBSBasic::ReceivedIntroJson always being
shown in window-basic-main.cpp from that method downwards. We can work
around that by starting and ending the if-scope outside of the ifdefs.

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