Set v_texCoord in mystery mode

Bumps [scratch-svg-renderer](https://github.com/LLK/scratch-svg-renderer) from 0.2.0-prerelease.20210225205629 to 0.2.0-prerelease.20210317184701.
- [Release notes](https://github.com/LLK/scratch-svg-renderer/releases)
- [Commits](https://github.com/LLK/scratch-svg-renderer/compare/0.2.0-prerelease.20210225205629...0.2.0-prerelease.20210317184701)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -53,7 +53,7 @@
     "minilog": "3.1.0",
     "raw-loader": "^0.5.1",
     "scratch-storage": "^1.0.0",
-    "scratch-svg-renderer": "0.2.0-prerelease.20210225205629",
+    "scratch-svg-renderer": "0.2.0-prerelease.20210317184701",
     "twgl.js": "4.4.0"
   }
 }

src/RenderWebGL.js

@@ -258,7 +258,7 @@ class RenderWebGL extends EventEmitter {
         if (canvas.width !== newWidth || canvas.height !== newHeight) {
             canvas.width = newWidth;
             canvas.height = newHeight;
-
+            
             if (this._mystery.modeActive && this._mystery.bufferInfo) {
                 twgl.resizeFramebufferInfo(this._gl, this._mystery.bufferInfo, [
                     {format: this._gl.RGBA}