client: Make SVG icons PNGs

piket_client/gui.py

 
         # Left
         self.toolbar.addAction(
-            self.load_icon("add_person.svg"), "+ Naam", self.add_person
+            self.load_icon("add_person.png"), "+ Naam", self.add_person
         )
         self.undo_action = self.toolbar.addAction(
-            self.load_icon("undo.svg"), "Oeps", self.do_undo
+            self.load_icon("undo.png"), "Oeps", self.do_undo
         )
         self.undo_action.setDisabled(True)
 
         self.toolbar.addAction(
-            self.load_icon("quit.svg"), "Afsluiten", self.confirm_quit
+            self.load_icon("quit.png"), "Afsluiten", self.confirm_quit
         )
 
         self.toolbar.addWidget(self.create_spacer())
 
         # Right
         self.toolbar.addAction(
-            self.load_icon("add_consumption_type.svg"),
+            self.load_icon("add_consumption_type.png"),
             "Nieuw",
             self.add_consumption_type,
         )
 
         for ct in cts:
             action = QAction(
-                self.load_icon(ct.icon or "beer_bottle.svg"), ct.name, self.ct_ag
+                self.load_icon(ct.icon or "beer_bottle.png"), ct.name, self.ct_ag
             )
             action.setCheckable(True)
             action.setData(str(ct.consumption_type_id))
             ct = ct.create()
 
             action = QAction(
-                self.load_icon(ct.icon or "beer_bottle.svg"), ct.name, self.ct_ag
+                self.load_icon(ct.icon or "beer_bottle.png"), ct.name, self.ct_ag
             )
             action.setCheckable(True)
             action.setData(str(ct.consumption_type_id))