Varia: Fixes theme URI link in main stylesheet

varia/style-rtl.css

@@ -1,7 +1,7 @@
 @charset "UTF-8";
 /*
 Theme Name: Varia
-Theme URI: https://github.com/Automattic/themes/varia
+Theme URI: https://github.com/Automattic/themes/tree/master/varia
 Author: Automattic
 Author URI: https://automattic.com/
 Description: A variable-based design system for WordPress sites built with Gutenberg.

varia/style.css

@@ -1,7 +1,7 @@
 @charset "UTF-8";
 /*
 Theme Name: Varia
-Theme URI: https://github.com/Automattic/themes/varia
+Theme URI: https://github.com/Automattic/themes/tree/master/varia
 Author: Automattic
 Author URI: https://automattic.com/
 Description: A variable-based design system for WordPress sites built with Gutenberg.

varia/style.scss

@@ -1,6 +1,6 @@
 /*
 Theme Name: Varia
-Theme URI: https://github.com/Automattic/themes/varia
+Theme URI: https://github.com/Automattic/themes/tree/master/varia
 Author: Automattic
 Author URI: https://automattic.com/
 Description: A variable-based design system for WordPress sites built with Gutenberg.