Fix positioning and sizing of e2e icon in the composer

This also removes the special case class for the composer because the input is now aligned regardless of icon.

src/components/views/rooms/MessageComposer.js

@@ -353,13 +353,9 @@ export default class MessageComposer extends React.Component {
             );
         }
 
-        const wrapperClasses = classNames({
-            mx_MessageComposer_wrapper: true,
-            mx_MessageComposer_hasE2EIcon: !!this.props.e2eStatus,
-        });
         return (
             <div className="mx_MessageComposer">
-                <div className={wrapperClasses}>
+                <div className="mx_MessageComposer_wrapper">
                     <div className="mx_MessageComposer_row">
                         { controls }
                     </div>