Do not install polkit-gnome for blivet-gui

[vojtechtrefny]

blivet-gui-runtime doesn't depend on PolicyKit-authentication-agent only blivet-gui which is not on the installation images depends on polkit.

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This was originally added by @AdamWill in 07f3e48 and I am not sure why, the blivet-gui-runtime package never depended on PolicyKit-authentication-agent. Maybe this was before the split into blivet-gui and blivet-gui-runtime.

$ sudo dnf repoquery --requires blivet-gui-runtime
Last metadata expiration check: 1:59:21 ago on Tue 19 Sep 2023 10:37:38 AM CEST.
/usr/bin/python3
gtk3
libreport
python(abi) = 3.11
python3
python3-blivet >= 1:3.3.0
python3-gobject
python3-pid

I did a quick test without this rule and the resulting image doesn't have any polkit agent installed, so I think it should be safe to remove this.

[coveralls]

Pull Request Test Coverage Report for Build 6234503630

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 43.325%

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Totals
Change from base Build 6115312116:	0.0%
Covered Lines:	1578
Relevant Lines:	3435

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💛 - Coveralls

[AdamWill]

You moved the requirement in 2.2.0-1:

* Fri Sep 11 2020 Vojtech Trefny <vtrefny@redhat.com> - 2.2.0-1
...
- Move the PolicyKit agent dependency from runtime to blivet-gui (vtrefny)

we must have had a build older than that in stable at the time I was working on that image oversize issue, for whatever branch it was on. Since the dep has been moved, I agree this should probably be fine.

[bcl]

Thanks!