chore: remove unneeded workaround for capabilities

[ledif]

Capabilities can be set in the Containerfile directly. This workaround has been removed in Bazzite (ublue-os/bazzite@c47e125) in favor of setting caps directly.

I manually tested and confirmed the capabilities are still the same using aurora-dx in a VM.

Before

❯ getcap /usr/libexec/ksysguard/ksgrd_network_helper
/usr/libexec/ksysguard/ksgrd_network_helper cap_net_raw=ep

❯ systemctl status kde-sysmonitor-workaround.service
● kde-sysmonitor-workaround.service - Workaround KDE System Monitor not having the correct caps
     Loaded: loaded (/usr/lib/systemd/system/kde-sysmonitor-workaround.service; enabled; preset: disabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf, 50-keep-warm.conf
     Active: active (exited) since Sun 2024-12-29 12:54:08 CST; 51min ago
 Invocation: a6ee1a1f62ac4108875cfce529fe3aef
    Process: 1331 ExecStartPre=/usr/bin/bash -c [ -x /usr/local/libexec/.ksysguard/ksgrd_network_helper ] || /usr/bin/cp /us>
    Process: 1361 ExecStartPre=/usr/bin/mount --bind /usr/local/libexec/.ksysguard/ksgrd_network_helper /usr/libexec/ksysgua>
    Process: 1378 ExecStart=/usr/sbin/setcap cap_net_raw+ep /usr/libexec/ksysguard/ksgrd_network_helper (code=exited, status>
   Main PID: 1378 (code=exited, status=0/SUCCESS)
   Mem peak: 1.2M
        CPU: 11ms

After

❯ getcap /usr/libexec/ksysguard/ksgrd_network_helper
/usr/libexec/ksysguard/ksgrd_network_helper cap_net_raw=ep

❯ systemctl status kde-sysmonitor-workaround.service
Unit kde-sysmonitor-workaround.service could not be found.