community/rofi: upgrade to 1.7.5

https://github.com/davatorium/rofi/releases/tag/1.7.5

1.7.4...1.7.5

A quick bug-fix release to fix 3 small issues.

• In DMenu sync mode, the separator is left in the string.
• On special crafted delayed input in dmenu it shows updates to the list very slow. It now forces to push update (if there) every 1/10 of a second.
• In the view some of the update/redraw policies are fixed to reduced the perceived delay.