[BUGFIX] Restore layout of clipboard buttons in filelist and recordlist

Will set equal height for checked checkbox and the empty button.
The first button will now get a border-radius to streamline the
buttons according to the action buttons

Resolves: #93292
Releases: master
Change-Id: I6479c968f77df41ed00d23d68c5ec23363ac64a3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67449Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Richard Haeser <richard@richardhaeser.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Benni Mack <benni@typo3.org>

Build/Sources/Sass/typo3/_element_panel.scss

@@ -108,6 +108,10 @@ $panel-lg-padding: 35px;
     > .table-fit {
         margin: 0;
     }
+
+    label {
+        margin-bottom: 0;
+    }
 }
 
 .recordlist {

typo3/sysext/filelist/Classes/FileList.php

@@ -957,7 +957,7 @@ class FileList
             $n = '_FILE|' . $md5;
             $this->CBnames[] = $n;
             $checked = $this->clipObj->isSelected('_FILE', $md5) ? ' checked="checked"' : '';
-            $cells[] = '<input type="hidden" name="CBH[' . $n . ']" value="0" /><label class="btn btn-default btn-checkbox"><input type="checkbox" name="CBC[' . $n . ']" value="' . htmlspecialchars($fullIdentifier) . '" ' . $checked . ' /><span class="t3-icon fa"></span></label>';
+            $cells[] = '<label class="btn btn-default btn-checkbox"><input type="checkbox" name="CBC[' . $n . ']" value="' . htmlspecialchars($fullIdentifier) . '" ' . $checked . ' /><span class="t3-icon fa"></span><input type="hidden" name="CBH[' . $n . ']" value="0" /></label>';
         }
         // Display PASTE button, if directory:
         $elFromTable = $this->clipObj->elFromTable('_FILE');