Fix gdlint findings in Global / Database / Levels

- Global.gd: move @onready var animation below the regular vars
  (gdlint class-definitions-order expects onready vars after
  public/private vars).
- Database.gd::DB: move the three _*_PROPS constants above the vars
  (constants come before vars in a class body).
- Levels.gd:_search_button_to_use: drop the elif after a branch
  that returns (no-elif-return).
- Levels.gd:_gyroscope_changed_{down,up}: continuation lines of the
  multi-line return mixed two tabs + three spaces; normalised to
  pure tabs.

No semantic change: @onready is property-level so source ordering
doesn't affect init; elif after a return is equivalent to if; the
continuation indent is cosmetic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/Database.gd

@@ -9,11 +9,6 @@ extends Node
 # (per-scene lock state) persists across runs.
 
 class DB extends RefCounted:
-	var settings: SettingsData
-	var levels: Array[LevelEntry] = []
-	var scenes: Array[SceneEntry] = []
-	var _path: String
-
 	const _SETTINGS_PROPS := [
 		{"name": "langue", "type": "1", "auto_increment": "0"},
 		{"name": "gyroscope", "type": "0", "auto_increment": "0"},
@@ -36,6 +31,11 @@ class DB extends RefCounted:
 		{"name": "counter", "type": "1", "auto_increment": "0"},
 	]
 
+	var settings: SettingsData
+	var levels: Array[LevelEntry] = []
+	var scenes: Array[SceneEntry] = []
+	var _path: String
+
 	func _init(path: String) -> void:
 		_path = path
 		var f := FileAccess.open(path, FileAccess.READ)