Change typo in unittests.js (#13907)
Change typo in unittests.js (#13907)

exclution -> exclusion
ficristo/brackets,sprintr/brackets,adobe/brackets,adobe/brackets,ficristo/brackets,ficristo/brackets,adobe/brackets,ficristo/brackets,adobe/brackets,sprintr/brackets,ficristo/brackets,sprintr/brackets,sprintr/brackets,adobe/brackets,sprintr/brackets