Fix: add missing semicolon to pass ESLint

Author: vikas-sharma123

js/activity.js

@@ -48,7 +48,7 @@
  */
 const LEADING = 0;
 const BLOCKSCALES = [1, 1.5, 2, 3, 4];
-const _THIS_IS_MUSIC_BLOCKS_ = true;oninput
+const _THIS_IS_MUSIC_BLOCKS_ = true;oninput;
 const _THIS_IS_TURTLE_BLOCKS_ = !_THIS_IS_MUSIC_BLOCKS_;
 
 const _ERRORMSGTIMEOUT_ = 15000;