Move Blockly.BlockSvg.TAB_WIDTH override to block_svg.js

Author: Aaron Imming

src/scratch/hooks/block_svg.js

@@ -1,6 +1,10 @@
-/* eslint-disable func-names, no-underscore-dangle */
 import { translate } from '../../utils/lang/i18n';
 
+/* eslint-disable func-names, no-underscore-dangle */
+
+// deriv-bot: Blockly value, Scratch resets this to 0, req for correct spacing in flyout.
+Blockly.BlockSvg.TAB_WIDTH = 8;
+
 /**
  * Set whether the block is disabled or not.
  * @param {boolean} disabled True if disabled.