Change faded background color for modal dialogs

customize.dist/src/less2/include/colortheme.less

@@ -34,7 +34,7 @@
 @colortheme_modal-fg: @colortheme_form-color-alt;
 @colortheme_modal-link: @colortheme_link-color;
 @colortheme_modal-link-visited: lighten(@colortheme_modal-link, 10%);
-@colortheme_modal-dim: fade(@colortheme_logo-2, 50%); // TODO transparent background behind modals
+@colortheme_modal-dim: fade(@cryptpad_text_col, 50%); // TODO transparent background behind modals
 @colortheme_modal-input: @colortheme_form-bg;
 @colortheme_modal-input-fg: @colortheme_form-color;