Fix crash when switching to Samsung account in editor.

Need to clear the current sorted mimetypes when setting state,
since each account type might not support the same mimetypes.
In the case of Google -> Samsung, Samsung doesn't have SIP
addresses.

Test:
Tested switching from Google Account to Samsung account.

Bug: 31552749
Change-Id: I1504040716c1ba3929747d84940a3b2da10959e4