Customize: Ensure that "Change" button appears when there are only 2 themes.

Fixes defect introduced in [35535].

Props igmoweb.
See #34549.
Fixes #35081.


git-svn-id: https://develop.svn.wordpress.org/trunk@35943 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/customize/class-wp-customize-themes-section.php

@@ -46,7 +46,7 @@ class WP_Customize_Themes_Section extends WP_Customize_Section {
 				}
 				?>
 
-				<?php if ( count( $this->controls ) > 1 ) : ?>
+				<?php if ( count( $this->controls ) > 0 ) : ?>
 					<button type="button" class="button change-theme" tabindex="0"><?php _ex( 'Change', 'theme' ); ?></button>
 				<?php endif; ?>
 			</h3>