fix(dropdown): dont adjustment dropdown icon when inside a label button

Since 2.7.7 the dropdown icon adjustments got increased specificity by #838
Unfortunately this also had impact if the dropdown was used in combination with a labeled button
I had to revert the specificity increase, but the additional :not(labeled) fixes the previous issues as well (and keeping the additional .icon would have messed up general dropdowns in combination :not(.labeled) then.
So this PR should fix all three issues now (tested by using the fiddles from the original issues and modding via developer console tools)


Closes #1058 #837 #458

Author: lubber-de

src/definitions/modules/dropdown.less

@@ -84,7 +84,7 @@
  Dropdown Icon
 ---------------*/
 
-.ui.dropdown > .dropdown.icon.icon {
+.ui.dropdown:not(.labeled) > .dropdown.icon {
   position: relative;
   width: auto;
   font-size: @dropdownIconSize;