Fixed horizontal alignment of no draft graphic (#28224)

* Fixed horizontal alignment of no draft graphic

* Lint fix

webapp/channels/src/components/drafts/drafts.scss

@@ -16,6 +16,7 @@
         position: absolute;
         display: flex;
         overflow: auto;
+        width: 100%;
         height: 100%;
         flex-flow: column nowrap;
         padding: 24px;