Update SiteTitle block to Fix isLink Toggle Behavior (WordPress#68295)

* Update link reset logic in SiteTitle

* Fix condition for link value in SiteTitleEdit component

Co-authored-by: Sukhendu2002 <sukhendu2002@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: fabiankaegy <fabiankaegy@git.wordpress.org>

packages/block-library/src/site-title/edit.js

@@ -123,16 +123,16 @@ export default function SiteTitleEdit( {
 					label={ __( 'Settings' ) }
 					resetAll={ () => {
 						setAttributes( {
-							isLink: false,
+							isLink: true,
 							linkTarget: '_self',
 						} );
 					} }
 					dropdownMenuProps={ dropdownMenuProps }
 				>
 					<ToolsPanelItem
-						hasValue={ () => isLink !== false }
+						hasValue={ () => ! isLink }
 						label={ __( 'Make title link to home' ) }
-						onDeselect={ () => setAttributes( { isLink: false } ) }
+						onDeselect={ () => setAttributes( { isLink: true } ) }
 						isShownByDefault
 					>
 						<ToggleControl