fix plot_fraction signature

Author: emanuel-schmid

climada/hazard/plot.py

@@ -175,7 +175,15 @@ def plot_intensity(
 
         raise ValueError("Provide one event id or one centroid id.")
 
-    def plot_fraction(self, event=None, centr=None, smooth=True, axis=None, **kwargs):
+    def plot_fraction(
+        self,
+        event=None,
+        centr=None,
+        smooth=True,
+        axis=None,
+        mask_distance=0.03,
+        **kwargs,
+    ):
         """Plot fraction values for a selected event or centroid.
 
         Parameters