[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/iminuit/qtwidget.py

@@ -338,7 +338,9 @@ def on_parameter_change(self, from_fit=False, report_success=False):
 
             if from_fit:
                 self.results_text.clear()
-                self.results_text.setHtml(f"<div style='text-align: center;'>{minuit.fmin._repr_html_()}</div>")
+                self.results_text.setHtml(
+                    f"<div style='text-align: center;'>{minuit.fmin._repr_html_()}</div>"
+                )
             else:
                 self.results_text.clear()