Handle the UnicodeScalar type rename to Unicode.Scalar.
Handle the UnicodeScalar type rename to Unicode.Scalar.

Have to adjust the name of the type the formatter matches.  It looks
like you can still spell this UnicodeScalar so I left the old match
in place.

<rdar://problem/32149438>

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb