Match tag styles on meeting and orga level

[Elblinator]

Currently:
The appearance from the tags on the Orga-level and the meeting-level differ:

Tags-list on Orga-level:

Orga Tags on something (here a committee):

Tags-list on Meeting-level:

Meeting Tags on something (here a motion):

Wanted:
The Tags on the Orga level and the meeting level should be displayed in the same manner
Backend:

• Match tag styles on meeting and orga level openslides-backend#2381
• first/waiting for: changes in backend: additional field colour, and the ability to set it using tag.update and -create
• for already created tags I would recommend setting the colour to the accent colour

Client:

• The client needs to allow to create/update tags with colour
• The client needs to display the tags with the same outline and according colour as the orga-tags