chore(package): update scratch-blocks to version 0.1.0-prerelease.1549990124

Closes #4540

package.json

@@ -105,7 +105,7 @@
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20190114210212",
-    "scratch-blocks": "0.1.0-prerelease.1549643185",
+    "scratch-blocks": "0.1.0-prerelease.1549990124",
     "scratch-l10n": "3.1.20190211142555",
     "scratch-paint": "0.2.0-prerelease.20190114205252",
     "scratch-render": "0.1.0-prerelease.20190208165820",