qt/splashscreen: #include version.h
qt/splashscreen: #include version.h

Needed to build breakage reported by Arnavion on IRC:
qt/splashscreen.cpp: In constructor 'SplashScreen::SplashScreen(const QPixmap&, Qt::WindowFlags, bool)':
qt/splashscreen.cpp:33:98: error: 'FormatFullVersion' was not declared in this scope

(cherry picked from commit 11a899445edf3e07317eb312d3c1d9c71c06f618)

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