MultiMC: added qt5-svg as dependency for proper rendering of icons

[faerryn]

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[faerryn]

In MultiMC, changing the icons in Settings/MultiMC/User Interface/Icons provides no icons other than the default. qt5-svg is needed to render the other MultiMC icon sets.