[android] Fix brush speed lurching

Carsten Hartenfelsrequested to merge
hartenfels/krita:feature/bug-517054 into master

Made the speed smoother disregard repeated positions. These occur all the time on Android, but pretty sure they're gonna be bogus everywhere, so I didn't ifdef it.

Also fixed a typo that caused the tablet history workaround to pull the wrong setting value on startup (they're usually going to be both false or both true though.)

(This isn't the last problem with the speed smoother, you still get big blotches at the beginning of a stroke since its assumption that tablets have a steady sample rate is wrong. Both on Android and Linux, my tablets have a significantly lower sample rate while the stylus is in the air, so there's a huge speed difference between them.)

Test Plan

For the speed stuff, see BUG:517054.

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