Bug 470903

SUMMARY
When sorting tasks in the system monitor by a metric of any particular column (CPU Time/Memory/...), the icon displayed next to the column header to indicate the sort order seemingly isn't consistent with the actual sort order. The indicated sort order is exactly the opposite.

I interpret the "^" and "v" indicator symbols as rotated "greater than"/"smaller than" symbols. Just like "1<4", I expect top elements to be smaller than bottom elements if the displayed 

There are probably other interpretations than this (for example one could consider the indicator symbols as stylized arrows instead, which wouldn't clearly imply any particular meaning though), but (from a design perspective) I couldn't think of any that would uniquely imply the ordering *currently* used by system monitor. More importantly, my interpretation is also consistent with MacOS and with Dolphin (the only other KDE software I could think of that has sortable columns).

STEPS TO REPRODUCE
1. Open system monitor
2. Click on the "Memory" column in system monitor to sort tasks by memory use. If need be, click twice so it shows the "^" icon

OBSERVED RESULT
The process with the largest memory consumption is at the top of the list. (NOT consistent with MacOS/Dolphin).

EXPECTED RESULT
The process with the largest memory consumption should be at the bottom of the list. The one with the *lowest* memory use should be at the top. (Consistent with MacOS and Dolphin)

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9