Improve style in many demos (#1263)

networking/multiplayer_pong/logic/ball.gd

@@ -3,7 +3,7 @@ extends Area2D
 const DEFAULT_SPEED = 100.0
 
 var direction := Vector2.LEFT
-var stopped := false
+var stopped: bool = false
 var _speed := DEFAULT_SPEED
 
 @onready var _screen_size := get_viewport_rect().size

networking/multiplayer_pong/logic/paddle.gd

@@ -2,10 +2,10 @@ extends Area2D
 
 const MOTION_SPEED = 150
 
-@export var left := false
+@export var left: bool = false
 
 var _motion := 0.0
-var _you_hidden := false
+var _you_hidden: bool = false
 
 @onready var _screen_size_y := get_viewport_rect().size.y
 

networking/multiplayer_pong/logic/pong.gd

@@ -36,7 +36,7 @@ func update_score(add_to_left: int) -> void:
 		score_right += 1
 		score_right_node.set_text(str(score_right))
 
-	var game_ended := false
+	var game_ended: bool = false
 	if score_left == SCORE_TO_WIN:
 		winner_left.show()
 		game_ended = true