ScrollablePanel::getInnerSize() now always subtracts the scrollbar wi… #705

Job	Run time
ios-sfml-graphics	50s
ios-sdl	3m 24s
android-sdl	4m 56s
android-sfml-graphics	1m 46s
linux	4m 56s
linux-latest-dev	4m 30s
linux-oldest	3m 6s
linux-per-backend	5m 20s
macos	1m 46s
windows	2m 43s
windows-clang	6m 1s
windows-oldest	6m 28s
windows-static-mt	5m 2s
nightly-build-windows-visual-studio	7m 16s
	58m 4s

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