Run force-unlock with -no-color flag

[HadrienPatte]

This adds the -no-color flag by default to the force-unlock command.

Without this patch we can get ForceUnlock error:

exit status 1
�[31mFailed to unlock state: Lock ID should be numerical value, got 'ID'�[0m�[0m

With this patch the error becomes:

exit status 1
Failed to unlock state: Lock ID should be numerical value, got 'ID'

(I purposefully ran ForceUnlock with an invalid argument here to have it error out)

[hashicorp-cla]

All committers have signed the CLA.

[kmoe]

LGTM. I'm going to follow up with some tests, and will merge this PR when they are ready.