flowboxchild: Replace if statement with if expression

ks_includes/widgets/flowboxchild_extended.py

@@ -19,10 +19,7 @@ class PrintListItem(Gtk.FlowBoxChild):
         self.size = size
 
     def set_as_dir(self, is_dir: bool):
-        if is_dir:
-            self.dir = -1
-        else:
-            self.dir = 0
+        self.dir = -1 if is_dir else 0
 
     def set_path(self, path):
         self.path = path