Fix karma paths to draco decoder

tests/validation/karma.conf.browserstack.js

@@ -14,7 +14,7 @@ module.exports = function (config) {
         frameworks: ['mocha', 'chai', 'sinon'],
 
         files: [
-            './dist/preview%20release/draco_decoder.js',
+            './dist/preview release/draco_decoder.js',
             './Tools/DevLoader/BabylonLoader.js',
             './tests/validation/index.css',
             './tests/validation/integration.js',

tests/validation/karma.conf.js

@@ -14,7 +14,7 @@ module.exports = function (config) {
         frameworks: ['mocha', 'chai', 'sinon'],
 
         files: [
-            './dist/preview%20release/draco_decoder.js',
+            './dist/preview release/draco_decoder.js',
             './Tools/DevLoader/BabylonLoader.js',
             './tests/validation/index.css',
             './tests/validation/integration.js',