Move window.Headless annotation out of comment (pythonarcade#2102)

* Make the change in the normal window

* Mirror the change in the clock_window.py

Author: pushfoo

arcade/application.py

@@ -130,8 +130,8 @@ def __init__(
             gl_version = 3, 1
             gl_api = "gles"
 
-        #: bool: If this is a headless window
-        self.headless = pyglet.options.get("headless") is True
+        #: Whether this is a headless window
+        self.headless: bool = pyglet.options.get("headless") is True
 
         config = None
         # Attempt to make window with antialiasing

arcade/experimental/clock/clock_window.py

@@ -120,8 +120,8 @@ def __init__(
             gl_version = 3, 1
             gl_api = "gles"
 
-        #: bool: If this is a headless window
-        self.headless = pyglet.options.get("headless") is True
+        #: Whether this is a headless window
+        self.headless: bool = pyglet.options.get("headless") is True
 
         config = None
         # Attempt to make window with antialiasing