MAGETWO-34984: Invert new admin styles scope

- CR changes

Author: Evgeniy Kolesov

app/code/Magento/Downloadable/view/adminhtml/templates/product/edit/downloadable/samples.phtml

@@ -15,7 +15,7 @@
 $_product = $block->getProduct();
 $block->getConfigJson();
 ?>
-<fieldset class="admin__fieldset  downloadable-form">
+<fieldset class="admin__fieldset downloadable-form">
     <div class="admin__field"<?php echo !$block->isSingleStoreMode() ? ' data-config-scope="' . __('[STORE VIEW]') . '"' : ''; ?>>
         <label class="admin__field-label" for="downloadable_samples_title"><span><?php echo __('Title')?></span></label>
         <div class="admin__field-control">

app/code/Magento/Theme/view/adminhtml/page_layout/admin-2columns-left.xml

@@ -30,6 +30,7 @@
                     <container name="messages.wrapper" as="messages.wrapper" htmlTag="div" htmlId="messages">
                         <container name="page.messages" as="page.messages"/>
                     </container>
+                    <!-- ToDo UI: .col-gutter will be deprecated after #a0c2682 merged -->
                     <container name="page.main.container" as="page_main_container" htmlId="page:main-container" htmlTag="div" htmlClass="page-columns row row-gutter">
                         <!-- ToDo UI: remove 'main-col' & 'side-col' class names after new sidebar implemented -->
                         <container name="main.col" as="main-col" htmlId="container" htmlTag="div" htmlClass="main-col col-m-9 col-m-push-3 col-gutter">

app/design/adminhtml/Magento/backend/web/css/source/forms/_temp.less

@@ -77,7 +77,7 @@
         top: 1rem;
     }
     .address-list-item {
-        background: #F1F1F1;
+        background: #f1f1f1;
         border: 1px solid #d9d2ca;
         cursor: pointer;
         margin-bottom: -1px;
@@ -118,7 +118,7 @@
         }
     }
     address:first-line {
-        /*  its not work  if First Name and Last Name in two lines */
+        //  its not work  if First Name and Last Name in two lines
         font-weight: bold;
     }
     address {