kcms/touchpad: Remove weird Q_EMIT changed(false) in resizeEvent

Fabian Vogt requested to merge work/fvogt/kde449843 into master

That looks rather out of place there and does actually disable the apply button
when resizing the window. I don't understand what it's supposed to be doing
there, but if it has an actual purpose it needs to be addressed differently.

CCBUG: 449843

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