Resets title text color for CollectionViewAccountItem

The title text color was being changed on the VC, so we need to reset it as well.

BUG=674493

Review-Url: https://codereview.chromium.org/2627753002
Cr-Commit-Position: refs/heads/master@{#442882}

ios/chrome/browser/ui/collection_view/cells/collection_view_account_item.mm

@@ -242,6 +242,7 @@ const CGFloat kHorizontalErrorIconFixedSize = 25;
   self.imageView.image = nil;
   self.textLabel.text = nil;
   self.detailTextLabel.text = nil;
+  self.textLabel.textColor = [[MDCPalette greyPalette] tint900];
   self.detailTextLabel.textColor = [[MDCPalette greyPalette] tint500];
   self.errorIcon.image = nil;
   self.accessoryType = MDCCollectionViewCellAccessoryNone;