ref(chat): change chat bubble borders based on sender

For remote chat messages, all corners should be rounded
except the top left. For local messages all corners
should be rounded except the top right.

css/_chat.scss

     width: 93%;
     margin-left: 9px;
     margin-right: auto;
-    border-radius: 5px;
-    border-top-left-radius: 0px;
+    border-radius: 0px 6px 6px 6px;
     margin-top: 3px;
     color: white;
     padding-bottom: 3px;
     position: relative;
 
-    &.localuser .display-name {
-        color: #4C9AFF
+    &.localuser {
+        border-radius: 6px 0px 6px 6px;
+
+        .display-name {
+            color: #4C9AFF
+        }
     }
 
     &.error {
+        border-radius: 0px;
+
         .timestamp,
         .display-name {
             display: none;