Memory display is not correct on Fedora 36 [BUG]

[liyakun]

Describe the bug
The display of used memory is not correct on Fedora 36

To Reproduce
Open htop in the terminal and check the difference between htop and the shown memory usage from this applet.

Versions (please complete the following information):

• Version : 2.7.1
• KDE Plasma Version : 5.24.5
• KDE Frameworks Version : 5.93.0
• Qt Version : 5.15.3
• Kernel Version : 5.17.11-300.fc36.x86_64
• OS Type : Fedora Linux 36
• Graphics Platform : X11

[liyakun]

@orblazer the ram usage information is even different with the original software at https://github.com/kotelnik/plasma-applet-resources-monitor

The left side is from the original software and the right side is from this repository.

[orblazer]

Hello,
This is exactly same issue as #28.