Slight improvements to debugger, still wonky

src/backend/core/mmio/PIF.cpp

@@ -118,7 +118,7 @@ void PIF::LoadEeprom(const SaveType saveType, const std::string &path) {
 
     eeprom = mio::make_mmap_sink(eepromPath, 0, mio::map_entire_file, error);
     if (error) {
-      panic("Could not open {}", eepromPath);
+      panic("Could not open {}. Reason {}", eepromPath, error.message());
     }
   }
 }