Fix typo in pstAddHandler
Fix typo in pstAddHandler

This caused many warnings to appear in self-connection tests. A self
connection makes a local and a remote entry (it's both, technically) but
adding the remote handler wouldn't bump the count in the map, so it was
removed prematurely.

serokell/tw-rework-sketch,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl