Add STCP to Sociedade Transportes Colectivos do Porto

[isabelle-dr]

STCP is commonly used for Sociedade Transportes Colectivos do Porto (feed #2148).

It would be helpful to add STCP to the feed name or in the description to make it easier to find, following the other examples that exist on the Mobility Database:

• Gruppo Torinese Trasporti (GTT)
• Verkehrsverbund Rhein-Sieg (VRS)