resolve spacing issues with block list inline editor when it is the last property editor on the current tab

(cherry picked from commit 9a638b6edc)

src/Umbraco.Web.UI.Client/src/less/main.less

@@ -165,7 +165,7 @@ h6.-black {
     }
 }
 
-umb-property:last-of-type .umb-control-group {
+umb-property:last-of-type > .umb-property > ng-form > .umb-control-group {
     &::after {
         margin-top: 0px;
         height: 0;

src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/blocklistentryeditors/inlineblock/inlineblock.editor.less

@@ -6,6 +6,10 @@
     border-radius: @baseBorderRadius;
     transition: border-color 120ms, background-color 120ms;
 
+	.umb-box {
+		margin-bottom: 0;
+	}
+
     .umb-block-list__block:not(.--active) &:hover {
         border-color: @gray-8;
     }