Fixes for RC1 (#6376)

* PLT-6505 - Fixing z-index for post control menu

* PLT-6507 - Channel header icons not aligned

* PLT-6508 - Options popover issue on android

* PLT-6528 - Removing cross contamination on badge

* PLT-6535 - Aligning content in SSO buttons

* PLT-6509 - Aligning dropdown close icon

webapp/sass/layout/_post.scss

@@ -651,6 +651,12 @@
             visibility: visible;
         }
 
+        .post__header {
+            .col__reply {
+                z-index: 7;
+            }
+        }
+
         .post__body {
             background: transparent !important;
         }