Regression: Ctrl+F hotkey does not work in RAPPS

Steps to reproduce:

• Install ReactOS (or boot Live CD)
• Start RAPPS (in case of Live CD, run rapps.exe)
• Press Ctrl+F hotkey
• Expected behavior: Search box is focused and you can type text to search
• Observed behavior: Search box is not being focused

Regression is introduced in 0.4.15-dev-712-g4c7bd34 by kernel.bin after merging PR #3008.

Initial work for Ctrl+F hotkey was done in 0.4.10-dev-210-g0ec0881 by learn_more.