Apply suggestions from code review

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/_tools/eslint/rules/no-error-string-concat/test/fixtures/unvalidated.js

@@ -19,10 +19,9 @@
 'use strict';
 
 var valid = [];
-var test;
 
 // String concatenation in non-error constructor:
-test = {
+var test = {
 	'code': 'new MyClass( \'prefix\' + value );'
 };
 valid.push( test );

lib/node_modules/@stdlib/_tools/eslint/rules/no-error-string-concat/test/fixtures/valid.js

@@ -19,10 +19,9 @@
 'use strict';
 
 var valid = [];
-var test;
 
 // Using a string literal:
-test = {
+var test = {
 	'code': 'throw new Error( \'unexpected error.\' );'
 };
 valid.push( test );