make time marginalised likelihood use prior

This MR allows makes the time marginalised likelihood use the time prior provided, rather than marginalizing over the entire segment.

bilby/core/utils.py

@@ -678,5 +678,5 @@ else:
             matplotlib.use(backend, warn=False)
             plt.switch_backend(backend)
             break
-        except Exception as e:
+        except Exception:
             print(traceback.format_exc())