Fix clouds3d: remove orphan closing brace

A leftover '},' from the previous patch was producing an extra
closing brace at line 55 of the joined GLSL, causing '}' syntax
errors on every frame.

vendor/clouds3d.js

@@ -111,7 +111,6 @@ var FRAG_SRC = [
         'float twinkle = 0.55 + 0.45 * sin(uTime * 3.0 + h * 47.0);',
         'return mask * twinkle;',
     '}',
-    '}',
     'void main() {',
         'vec2 uv = (gl_FragCoord.xy / uResolution.xy) * 2.0 - 1.0;',
         'uv.x *= uResolution.x / uResolution.y;',