Revert "Add user-agent to authentication header, fixes SCC provider"

This reverts commit d273d502f3f7a81d578942d3e6f19c072a197373.
SCC Proper user-agent authentication header fix
FailedHandling fix
SNATCHED_PROPER Status on episode search (Fix issue #589)
Request and Parse TVRage ID's from newznab providers Prinz23