.github(Fedora): Rename the package

[norihiro]

Description

The package is renamed to obs-studio-plugin-command-source.

The package name should have the prefix obs-studio-plugin-.

How Has This Been Tested?

Confirmed it replaced the old package when installing with dnf.

================================================================================================================================================
 Package                                          Architecture           Version                             Repository                    Size
================================================================================================================================================
Installing:
 obs-studio-plugin-command-source                 x86_64                 0.5.0~rc2-1.fc38                    @commandline                  16 k
     replacing  obs-command-source.x86_64 0.5.0~rc1-1.fc37

Transaction Summary
================================================================================================================================================
Install  1 Package

General checklist

• The commit is reviewed by yourself.
• The code is tested.
• Document is up to date or not necessary to be changed.
• The commit is compatible with repository's license.