fix(region): replaces tabs for spaces in prior commit

my IDE was adding tabs ew, replaced with spaces

Refs: #4145

test/checks/navigation/region.js

@@ -49,7 +49,7 @@ describe('region', function () {
   it('should return false when img content is outside the region', function () {
     var checkArgs = checkSetup(`
       <img id="target" src="data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7">
-			<div role="main">Content</div>
+      <div role="main">Content</div>
     `);
 
     assert.isFalse(checkEvaluate.apply(checkContext, checkArgs));
@@ -58,7 +58,7 @@ describe('region', function () {
   it('should return true when img content outside of the region is decorative, via an empty alt attr', function () {
     var checkArgs = checkSetup(`
       <img id="target" src="#" width="1" height="1" alt="" />
-			<div role="main">Content</div>
+      <div role="main">Content</div>
     `);
 
     assert.isTrue(checkEvaluate.apply(checkContext, checkArgs));
@@ -67,7 +67,7 @@ describe('region', function () {
   it('should return true when img content outside of the region is decorative, via a presentation role', function () {
     var checkArgs = checkSetup(`
       <img id="target" src="#" width="1" height="1" role="presentation />
-			<div role="main">Content</div>
+      <div role="main">Content</div>
     `);
 
     assert.isTrue(checkEvaluate.apply(checkContext, checkArgs));