tst_licenses: omit qmake testdata directory
tst_licenses: omit qmake testdata directory

Don't check for license headers in that directory and sub-directories,
they may or may not have a valid license header.

Change-Id: I3a57913d03f5960ef478a967548198dc75a88800
Reviewed-by: Jason McDonald <209f3df99c2799391767e4088e50e0880fdf6ca4@gmail.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa