Multiple labels need to be in an array of strings

[adbridge]

Summary of changes

Updated the remove conditions with multiple labels to make them arrays of strings. In the current format the first label got removed but the 2nd label got added instead. This is obviously not as intended.

Impact of changes

Being listed individually one below the other did not work. According to the documentation it should be configured as an array. This should lead to both labels (if present) being removed.

Migration actions required

Documentation

---

Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

---

Test results

[x] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

---

Reviewers

---

[bulislaw]

Looks good, but we should convert all the usage of both add and remove to this style to limit the future errors. Eg. someone just adds: one - "needs rather than converts it to a array.

[bulislaw]

Good for testing.

[bulislaw]

LGTM

[adbridge]

Ci started