fix(buffer): remove unused eslint-disable directives in polyfill.js

---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: na
  - task: run_c_examples
    status: na
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: na
  - task: run_c_benchmarks
    status: na
  - task: run_cpp_benchmarks
    status: na
  - task: run_fortran_benchmarks
    status: na
  - task: run_javascript_benchmarks
    status: na
  - task: run_julia_benchmarks
    status: na
  - task: run_python_benchmarks
    status: na
  - task: run_r_benchmarks
    status: na
  - task: run_javascript_tests
    status: na
---

Author: abdelrahman04

lib/node_modules/@stdlib/buffer/from-string/lib/polyfill.js

@@ -49,9 +49,9 @@ function fromString( str, encoding ) {
 		if ( !isString( encoding ) ) {
 			throw new TypeError( format( 'invalid argument. Second argument must be a string. Value: `%s`.', encoding ) );
 		}
-		return new Buffer( str, encoding ); // eslint-disable-line no-buffer-constructor
+		return new Buffer( str, encoding );
 	}
-	return new Buffer( str, 'utf8' ); // eslint-disable-line no-buffer-constructor
+	return new Buffer( str, 'utf8' );
 }