Friction: Fix open stricker edit.

src/View/Frictions/Window.py

@@ -240,17 +240,15 @@ class FrictionsWindow(PamhyrWindow):
         self._table.redo()
 
     def edit_stricklers(self):
-        strick = self.sub_win_filter_first(
-            "Stricklers",
-            contain=[]
-        )
+        if self.sub_window_exists(
+            StricklersWindow,
+            data=[self._study, self.parent.conf]
+        ):
+            return
 
-        if strick is None:
-            strick = StricklersWindow(
-                study=self._study,
-                config=self.parent.conf,
-                parent=self
-            )
-            strick.show()
-        else:
-            strick.activateWindow()
+        strick = StricklersWindow(
+            study=self._study,
+            config=self.parent.conf,
+            parent=self
+        )
+        strick.show()