Bug fix: Ctrl-activated color picker no longer glitches out when double clicking with a mouse.

Summary:
Currently a glitch exists where double clicking with a mouse while using the ctrl key-activated color picker causes the KisAbstractInputAction::eventPos and `KisAbstractInputAction::eventPosF functions to return an incorrect value, which then causes the ctrl-picker to return an undefined and unwanted color (usually black or white).

This patch fixes this bug by simply adding the QEvent::MouseButtonDblClick case to both switch statements, returning the correct position info for the abstract input events.

I believe this should close https://bugs.kde.org/show_bug.cgi?id=394396 . Although the user reported a crash associated with this bug, I was unable to reproduce any.

I also threw in some tiny formatting/style changes while I was in those files.

Test Plan:
Using a mouse, select the Brush Tool, hold the Ctrl Key to pop up a color picker, and double click.

Without this patch applied the picked color will often incorrectly be pure black or pure white, which seems to change depending on the zoom level.

After this patch, double clicking should not create any unwanted or unpredictable behavior from the ctrl-picker.

BUG:394396
Reviewers: Krita, rempt, dkazakov
Reviewed By: Krita, dkazakov
Subscribers: Krita
Tags: Krita
Differential Revision: https://phabricator.kde.org/D12953