Show template center ui when no block is selected on top toolbar on t…

…emplate post editor

The central template ui to go back to the post was not showing after selecting a block in the canvas. We should only be collapsing this area when we're:
- editing a template
- top toolbar mode is on
- a block is selected
- a user has clicked to collapse the area
- the viewport is large

packages/edit-post/src/components/header/index.js

@@ -119,7 +119,9 @@ function Header( {
 							className={ classnames(
 								'selected-block-tools-wrapper',
 								{
-									'is-collapsed': isBlockToolsCollapsed,
+									'is-collapsed':
+										isEditingTemplate &&
+										isBlockToolsCollapsed,
 								}
 							) }
 						>
@@ -150,9 +152,10 @@ function Header( {
 				<div
 					className={ classnames( 'edit-post-header__center', {
 						'is-collapsed':
+							isEditingTemplate &&
 							! isBlockToolsCollapsed &&
-							isLargeViewport &&
-							isEditingTemplate,
+							hasFixedToolbar &&
+							isLargeViewport,
 					} ) }
 				>
 					{ isEditingTemplate && <DocumentActions /> }