Fix error when using visibility radius setting.

module.json

@@ -2,7 +2,7 @@
 	"name": "terrain-height-tools",
 	"title": "Terrain Height Tools",
 	"description": "Tools for painting grid cells with terrain heights and calculating line of sight with respect to these heights.",
-	"version": "0.5.0",
+	"version": "0.5.1",
 	"compatibility": {
 		"minimum": "12",
 		"verified": "12",

module/layers/terrain-height-graphics.mjs

@@ -190,18 +190,18 @@ export class TerrainHeightGraphics extends PIXI.Container {
 		// Create a radial gradient texture
 		radius *= canvas.grid.size;
 
-		const canvas = document.createElement("canvas");
-		canvas.width = canvas.height = radius * 2;
+		const canvasElement = document.createElement("canvas");
+		canvasElement.width = canvasElement.height = radius * 2;
 
-		const context = canvas.getContext("2d");
+		const context = canvasElement.getContext("2d");
 		const gradient = context.createRadialGradient(radius, radius, 0, radius, radius, radius);
 		gradient.addColorStop(0.8, "rgba(255, 255, 255, 1)");
 		gradient.addColorStop(1, "rgba(255, 255, 255, 0)");
 
 		context.fillStyle = gradient;
 		context.fillRect(0, 0, radius * 2, radius * 2);
 
-		const texture = PIXI.Texture.from(canvas);
+		const texture = PIXI.Texture.from(canvasElement);
 
 		// Create sprite
 		this.cursorRadiusMask = new PIXI.Sprite(texture);