Tests/LibWeb: Add ref test for implicit canvas moves/lines

Tests/LibWeb/Ref/canvas-implict-moves-and-lines.html

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+<link rel="match" href="reference/canvas-implict-moves-and-lines-ref.html" />
+<canvas id="canvas" width="300" height="300"></canvas>
+<style>
+  #canvas {
+    border: 1px solid black;
+  }
+
+  body {
+    background: white;
+  }
+</style>
+<script>
+const canvas = document.getElementById("canvas");
+const ctx = canvas.getContext("2d");
+{
+  ctx.beginPath();
+  ctx.moveTo(NaN, 0);  // Do nothing.
+  ctx.lineTo(25, 25);  // Equivalent to moveTo(25, 25)
+  ctx.lineTo(100, 25); // Line (25, 25) -> (100, 25)
+  ctx.stroke();
+}
+{
+  let cp1 = { x: 25, y: 75 };
+  let cp2 = { x: 114.6, y: 113.4 };
+  let end = { x: 119.72, y: 87.8  };
+  ctx.beginPath();
+  ctx.bezierCurveTo(cp1.x, cp1.y, NaN, cp2.y, end.x, end.y);   // Do nothing.
+  ctx.bezierCurveTo(cp1.x, cp1.y, cp2.x, cp2.y, end.x, end.y); // Curve from cp1.
+  ctx.stroke();
+}
+{
+  let cp = { x: 230, y: 230 };
+  let end = { x: 50, y: 200 };
+  ctx.beginPath();
+  ctx.quadraticCurveTo(cp.x, cp.y, 1000, NaN);    // Do nothing.
+  ctx.quadraticCurveTo(cp.x, cp.y, end.x, end.y); // Appears as line from cp to end.
+  ctx.stroke();
+}
+{
+  ctx.beginPath();
+  ctx.moveTo(200, 95);
+  ctx.ellipse(200, 100, 50, 75, Math.PI / 0, 0, 2 * Math.PI); // Do nothing.
+  ctx.ellipse(200, 100, 50, 75, Math.PI / 4, 0, 2 * Math.PI); // Ellipse with line from centre.
+  ctx.stroke();
+}
+</script>

Tests/LibWeb/Ref/reference/canvas-implict-moves-and-lines-ref.html

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+<style>
+  * {
+    margin: 0;
+  }
+  body {
+    background-color: white;
+  }
+</style>
+<img src="./images/canvas-implict-moves-and-lines-ref.png">