bug: large title header should not have bottom border

[liamdebeasi]

Bug Report

Ionic version:

[ ] 4.x
[x] 5.x

Current behavior:

In an app with the large title, there is a bottom border below the last toolbar. This was removed in iOS 13/14.

Expected behavior:

There should be no bottom border on the last toolbar.

Steps to reproduce:

1. Run npm run start in the core directory.
2. Go to http://localhost:3333/src/components/toolbar/test/title?ionic:mode=ios
3. Notice that there is a border below the search bar:
   

Related code:

1. We need to remove this code: https://github.com/ionic-team/ionic-framework/blob/master/core/src/components/header/header.ios.scss#L7-L9

Here is an example of the Reminders app on iOS:

[liamdebeasi]

Resolved via #22891

[ionitron-bot]

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