Ui ifxes (#5890)

* PLT-5975 - Back arrow in flag list cutting off

* PLT-6049 - Fixing pin icon color, and hover state

* PLT-5989 - Channel member and pin icon issue

* PLT-6067 - Pinned icon misaligned in firefox

* PLT-5885 - Adjusting icon spacing in modal

webapp/sass/base/_typography.scss

@@ -37,11 +37,11 @@ body {
 
 .fa {
     &.fa-margin--left {
-        margin-left: 2px;
+        margin-left: 3px;
     }
 
     &.fa-margin--right {
-        margin-right: 2px;
+        margin-right: 3px;
     }
 }