UI: Use valueChanged() signal for T-Bar everywhere

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The sliderMoved signal doesn't trigger when clicking on the slider, only
the valueChanged signal. According to QTBUG-72995 this is intentional,
since the documentation states that sliderDown also needs to be true for
the sliderMoved signal to be triggered. As for why sliderDown isn't true
when clicking, or why that would even be necessary for a signal that
should trigger when the slider is moved (and it very clearly moves)
remains a mystery.

Also gets rid of the wrong usage of the on_foo_bar slot declaration,
which should only be used for signals where the sender is part of a UI
file and it gets connected automatically. While it of course is possible
to connect it manually, this is against convention and can cause
confusion. In this case it was particularly wrong since even if tBar was
part of a UI file (which it isn't), the method should have been called
on_tBar_valueChanged instead of on_tbar_position_valueChanged.

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