Update ChannelHeader.scss

Author: TylerAHolden

src/styles/ChannelHeader.scss

@@ -274,7 +274,7 @@
 
 .str-chat__header-hamburger {
   width: 30px;
-  height: 40px;
+  height: 38px;
   padding: 10px 10px 10px 0px;
   margin-right: 10px;
   display: none;