eeschema: Update pin cache after conversion

Pin caches need to be updated when the unit is converted as the pin
location may have changed in conversion.

Fixes: lp:1816207
* https://bugs.launchpad.net/kicad/+bug/1816207

eeschema/getpart.cpp

@@ -383,6 +383,7 @@ void SCH_EDIT_FRAME::ConvertPart( SCH_COMPONENT* aComponent )
 
         // The alternate symbol may cause a change in the connection status so test the
         // connections so the connection indicators are drawn correctly.
+        aComponent->UpdatePinCache();
         TestDanglingEnds();
         aComponent->ClearFlags();
         aComponent->SetFlags( flags );   // Restore m_Flag (modified by SetConvert())