Fix bus error return not setting proper state

src/m68k.rs

@@ -747,6 +747,8 @@ impl M68K {
                     } else if last_cycle.is_err() {
                         self.stored_mem_cycles.pop();
                     }
+                    self.use_stored_mem_cycles = true;
+                    self.handling_bus_error = false;
                 } if format == 0 {
                      // Nothing extra needed
                 } else {