fix(@angular-devkit/build-angular): show bundle sizes with 2 decimal places

Before
```
Initial Chunk Files | Names     | Size
vendor.js           | vendor    | 2.07 MB
polyfills.js        | polyfills | 141.3 kb
main.js             | main      | 55.77 kb
runtime.js          | runtime   | 6.15 kb
styles.css          | styles    | 119 bytes
```

After
```
Initial Chunk Files | Names     | Size
vendor.js           | vendor    | 2.07 MB
polyfills.js        | polyfills | 141.30 kb
main.js             | main      | 55.77 kb
runtime.js          | runtime   | 6.15 kb
styles.css          | styles    | 119 bytes
```

Author: alan-agius4

packages/angular_devkit/build_angular/src/webpack/utils/stats.ts

@@ -21,8 +21,10 @@ export function formatSize(size: number): string {
 
   const abbreviations = ['bytes', 'kB', 'MB', 'GB'];
   const index = Math.floor(Math.log(size) / Math.log(1024));
-
-  return `${+(size / Math.pow(1024, index)).toPrecision(3)} ${abbreviations[index]}`;
+  const roundedSize = size / Math.pow(1024, index);
+  // bytes don't have a fraction
+  const fractionDigits = index === 0 ? 0 : 2;
+  return `${roundedSize.toFixed(fractionDigits)} ${abbreviations[index]}`;
 }
 
 export type BundleStatsData = [files: string, names: string, size: number | string];