fix(segment, dropdown): specificity and wrong selector

Hotfixes for #2683 and #2678

Author: lubber-de

src/definitions/elements/segment.less

@@ -761,11 +761,11 @@
     .ui.tab.segment[class*="bottom attached"]:last-child {
         margin-bottom: @verticalMargin;
     }
-    .ui[class*="left attached"].segment {
+    .ui.ui[class*="left attached"].segment {
         border-left: none;
         margin-left: 0;
     }
-    .ui[class*="right attached"].segment {
+    .ui.ui[class*="right attached"].segment {
         border-right: none;
         margin-right: 0;
     }

src/definitions/modules/dropdown.less

@@ -427,9 +427,9 @@ select.ui.dropdown {
             min-width: 0;
             & > .menu {
                 width: auto;
-            }
-            &:not(.multiline) {
-                width: max-content;
+                &:not(.multiline) {
+                    width: max-content;
+                }
             }
         }
     }