New maximized window size is calculated incorrectly

awesome v4.3-735-g002ecfd4-dirty (Too long)
• Compiled against Lua 5.1.5 (running with LuaJIT 2.1.0-beta3)
• API level: 4
• D-Bus support: yes
• xcb-errors support: no
• execinfo support: yes
• xcb-randr version: 1.6
• LGI version: 0.9.2
• Transparency enabled: yes
• Custom search paths: no

Hi, with current master I have an issue with maximized windows,
New maximized client (like firefox or chrome) size is calculated wrong, so window overlaps my bottom panel.
This also happens with all maximized clients upon awesome restart.

Unmaximize and maximize does fix window size.

This behavior was introduced with https://github.com/awesomeWM/awesome/commit/04c757322c079a8b9f13a51d0dc4c37e5a5b7965

Here is my config:
[rc.lua.txt](https://github.com/awesomeWM/awesome/files/4239144/rc.lua.txt)
[rc_rules.lua.txt](https://github.com/awesomeWM/awesome/files/4239146/rc_rules.lua.txt)