MM-58496 - Updating channel font size (#27445)

* MM-58496 - Updating channel font size

* Updating lineheight

webapp/channels/src/sass/components/_post.scss

@@ -1061,8 +1061,7 @@
     p {
         width: 100%;
         margin: 0;
-        font-size: 13.5px;
-        line-height: 1.6em;
+        line-height: 20px;
         white-space: pre-wrap;
         word-break: break-word;
     }
@@ -1466,8 +1465,6 @@
 
         ul,
         ol {
-            font-size: 13.5px;
-
             p {
                 margin-bottom: 0;
             }