Analytics await handle_exit blocks game when scene tree is paused

[francoisdlt]

Typical example :

• open pause menu
• scene tree is paused
• click quit game button
• await Analytics.handle_exit()
• get_tree().quit()

the await handle_exit() never yields, game does not quit

solution : set Analytics to PROCESS_MODE_ALWAYS

diff --git a/addons/quiver_analytics/analytics.gd b/addons/quiver_analytics/analytics.gd
--- a/addons/quiver_analytics/analytics.gd
+++ b/addons/quiver_analytics/analytics.gd
@@ -84,4 +84,5 @@
 
 func _ready() -> void:
+	process_mode = PROCESS_MODE_ALWAYS
 	# We attempt to load the saved configuration, if present
 	var err = config.load(config_file_path)