Compose file needs group_add string instead of int

[jtbrown6]

Problem: After most recent change, user will get the below error because the guacamole_compose container expects group_add as a string not an int.

Solution: wrap the 1000 in quotes to convert to string instead of int.

Problem Code Output:

docker compose up -d
1 error(s) decoding:

* 'group_add[0]' expected type 'string', got unconvertible type 'int', value: '1000'

[boschkundendienst]

added quotes pls test.