Remove unused variable in fixed-size.html.

misc/dist/html/fixed-size.html

@@ -236,7 +236,6 @@ $GODOT_HEAD_INCLUDE
 			const DEBUG_ENABLED = $GODOT_DEBUG_ENABLED;
 			const INDETERMINATE_STATUS_STEP_MS = 100;
 
-			var container = document.getElementById('container');
 			var canvas = document.getElementById('canvas');
 			var statusProgress = document.getElementById('status-progress');
 			var statusProgressInner = document.getElementById('status-progress-inner');