applet: Drop redundant workaround for semi-transparent sliders

ivan tkachenko requested to merge work/ratijas/unclip into master

It may have served its purpose with dignity, but is no longer needed in the presence of layer.enabled: opacity < 1 binding at the control level.

See also:

CCBUG: 434927

Note: this MR is based on !135 (merged), so there are actually two commits until that one is merged first.

Edited by ivan tkachenko

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