bug: header containing collapsible large title should use content background always

[brandyscarney]

Bug Report

Ionic version:

[x] 5.x

Current behavior:

Theme an app by adding at least the following variable:

:root {
  --ion-toolbar-background: red;
}

Expected behavior:

The large title toolbar should just use the content background since it needs to blend with the header above. Adding the following CSS to an app overrides this behavior:

/* TODO remove once fixed in framework */
.ios .header-collapse-condense ion-toolbar {
  --background: var(--ion-background-color, #fff);
}

Steps to reproduce:

This can be reproduced in the conference app by commenting out the added code above.

Related code:

insert short code snippets here

Other information:

Ionic info:

insert the output from ionic info here

[ionitron-bot]

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