Menu is not shown on Windows

[srirambv]

Test Plan

1. Clean install 0.19.x+C63 build
2. Press the Alt button, menu should be shown and retained until the user clicks elsewhere to hide it

Description

Menu is not shown on Windows

Steps to Reproduce

1. Clean install 0.19.106
2. Click on Alt
3. Menu shows and hides again

Actual result:

Expected result:
Should show the menu and retain it when Alt is pressed

Reproduces how often:
100%

Brave Version

about:brave info:

Brave	0.19.106
rev	88cb988
Muon	4.5.21
libchromiumcontent	63.0.3239.59
V8	6.3.292
Node.js	7.9.0
Update Channel	Release
OS Platform	Microsoft Windows
OS Release	10.0.16299
OS Architecture	x64

Reproducible on current live release:
No

Additional Information

[darkdh]

fixed by brave/muon@237a6ee
muon 4.5.22