change styles for chat in project section

Author: Awakich

projects/social_platform/src/app/office/features/message-input/message-input.component.scss

@@ -116,7 +116,7 @@ $button-size: 40px;
     background-color: var(--light-white);
     border-color: var(--medium-grey-for-outline);
     border-style: solid;
-    border-width: 0.5px 0.5px 0px 0.5px;
+    border-width: 0.5px 0.5px 0;
     border-top-left-radius: 10px;
     border-top-right-radius: 10px;
     box-shadow: 4px -4px 4px rgb(51 51 51 / 20%);