Update AdminSettingsSharingForm.vue

[castillo92]

Summary

If you visit Settings -> Administration -> Sharing you can see 3 options and I think the text could be improved because, in short, the title and options are:

"Limit sharing based on groups:"

• Allow all
• Exclude some groups
• Allow only some groups

And if you select any option, the textbox explain itself:

Line 133 :label="settings.excludeGroups === 'allow' ? t('settings', 'Groups allowed to share') : t('settings', 'Groups excluded from sharing')"

Therefore, I believe that text labels could be simplified.

TODO

• Agree to my proposal and change text label.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes

BEFORE:

• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)