[Remove Vuetify from Studio] Remove unused :v-deep styles from info modal

[MisRob]

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Sub-issue of #5060.

Complexity: Low

Summary

Some of these :v-deep styles in shared/views/InfoModal seem to never be used:

studio/contentcuration/contentcuration/frontend/shared/views/InfoModal.vue

Lines 73 to 77 in efb74db

	::v-deep p {
	font-size: 12pt;
	line-height: normal;
	color: var(--v-grey-darken3);
	}

Remove all styles that don't take any effect from here. This will also remove dependency on Vuetify color variable.

InfoModal is used from more locations in the app. One way to preview this is 'About licenses' modal in Settings > Storage > Request more space.

How to get there

• Login as user@a.com with password a
• Go to Settings > Storage > Request more space
• Click Open form
• Click on info button next to Who can use your content? (Note that button click is broken, fix here. Before the fix is released, temporarily modify code in InfoModal to make the modal visible.)

Guidance

• Read the project this issue is part of

Out of Scope

• Do not refactor any other areas of the codebase

Expected UI/UX changes

• None

Acceptance criteria

• The specification above is followed.
• All user interactions are manually tested with no regressions.
• There are no visual differences.