Fix cropped x-axis label in plots (#200)

Closes #190.

Author: dweindl

src/petab_gui/views/simple_plot_view.py

@@ -233,6 +233,7 @@ def _update_tabs(self, fig: plt.Figure):
             sub_ax.set_xlabel(ax.get_xlabel())
             sub_ax.set_ylabel(ax.get_ylabel())
             sub_ax.legend()
+            sub_fig.tight_layout()
 
             sub_canvas = create_plot_tab(
                 sub_fig,