Enhance contrast of the stripped track movement icon

Enhancement Summary

Enhance contrast of the stripped movement icon, and possibly switch to a more common 2-way arrow icon

Implementation Details / Mockup

Hello!

The strip used to move tracks in LMMS 1.3.0-alpha looks very low-contrast, like in my persepctive on my high-resolution screen, I can't even see it.

I suggest:
A) Making the dots white or green, or just any color that stands out; or
B) Make it a 2-way arrow design

Design with green strip

Design with arrow

Both of the above pictures are digitally manipulated general designs and NOT implemented in my version of the program.

The background is 3b424a, the dots are 23282c, and they are 2x2. they are LITERALLY 4 PIXELS in size AND 1.3 contrast ratio, the WCAG minimum is 3.0, that is LESS THAN HALF

Please search the issue tracker for existing feature requests before submitting your own.

• I have searched all existing issues and confirmed that this is not a duplicate.

No file or test is named in the issue, so first locate the track movement icon implementation in the desktop UI. Compare the current colors and size with the stated background, contrast ratio, and WCAG target, then confirm the selected higher-contrast or two-way-arrow design is visible and covered by the relevant UI checks.