refactor: simplify the windowed flag

do not declare multiple variables in the same line

ks_includes/KlippyGtk.py

@@ -210,7 +210,7 @@ class KlippyGtk:
         dialog = Gtk.Dialog(title=title, modal=True, transient_for=self.screen,
                             default_width=self.width, default_height=self.height)
         dialog.set_size_request(self.width, self.height)
-        if not self.screen.windowed:
+        if not self.screen.get_resizable():
             dialog.fullscreen()
 
         if buttons:

ks_includes/widgets/prompts.py

@@ -113,7 +113,7 @@ class Prompt:
         scroll.add(self.scroll_box)
 
         content = Gtk.Grid()
-        if not self.screen.windowed:
+        if not self.screen.get_resizable():
             content.attach(title, 0, 0, 1, 1)
             content.attach(close, 1, 0, 1, 1)
         content.attach(scroll, 0, 1, 2, 1)

screen.py

@@ -62,16 +62,17 @@ class KlipperScreen(Gtk.Window):
     panels = {}
     popup_message = None
     screensaver = None
-    printers = printer = None
+    printers = None
+    printer = None
     updating = False
     _ws = None
     screensaver_timeout = None
     reinit_count = 0
     max_retries = 4
-    initialized = initializing = False
+    initialized = False
+    initializing = False
     popup_timeout = None
     wayland = False
-    windowed = False
     notification_log = []
     prompt = None
     tempstore_timeout = None
@@ -131,7 +132,6 @@ class KlipperScreen(Gtk.Window):
             if mon_n > 0:
                 logging.error("Monitor selection is only supported for fullscreen")
             self.set_resizable(True)
-            self.windowed = True
         else:
             self.width = monitor.get_geometry().width
             self.height = monitor.get_geometry().height