quectel: fix debug output if QGPS isn't supported
FEATURE_NOT_SUPPORTED is equal 1 in the enum FeatureSupport, as a result even if QGPS isn't supported by modem debug message printed available support.
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FEATURE_NOT_SUPPORTED is equal 1 in the enum FeatureSupport, as a result even if QGPS isn't supported by modem debug message printed available support.