fix(@angular-devkit/build-angular): Don't use TAILWIND_MODE=watch

This was only used as a workaround for older postcss-loder versions. It is no longer necessary. Additionaly it does not work with polling.

Author: thecrypticace

Diff for: packages/angular_devkit/build_angular/src/webpack/configs/styles.ts

@@ -149,9 +149,6 @@ export function getStylesConfig(wco: WebpackConfigOptions): Configuration {
       );
     }
     if (tailwindPackagePath) {
-      if (process.env['TAILWIND_MODE'] === undefined) {
-        process.env['TAILWIND_MODE'] = buildOptions.watch ? 'watch' : 'build';
-      }
       extraPostcssPlugins.push(require(tailwindPackagePath)({ config: tailwindConfigPath }));
     }
   }