Only truncate autocomplete pulls of Emoji, Room and UserProvider

Leaving Commands and DuckDuckGo not truncated

src/autocomplete/EmojiProvider.js

@@ -101,7 +101,7 @@ export default class EmojiProvider extends AutocompleteProvider {
     }
 
     renderCompletions(completions: [React.Component]): ?React.Component {
-        return <div className="mx_Autocomplete_Completion_container_pill">
+        return <div className="mx_Autocomplete_Completion_container_pill mx_Autocomplete_Completion_container_truncate">
             {completions}
         </div>;
     }

src/autocomplete/RoomProvider.js

@@ -78,7 +78,7 @@ export default class RoomProvider extends AutocompleteProvider {
     }
 
     renderCompletions(completions: [React.Component]): ?React.Component {
-        return <div className="mx_Autocomplete_Completion_container_pill">
+        return <div className="mx_Autocomplete_Completion_container_pill mx_Autocomplete_Completion_container_truncate">
             {completions}
         </div>;
     }

src/autocomplete/UserProvider.js

@@ -115,7 +115,7 @@ export default class UserProvider extends AutocompleteProvider {
     }
 
     renderCompletions(completions: [React.Component]): ?React.Component {
-        return <div className="mx_Autocomplete_Completion_container_pill">
+        return <div className="mx_Autocomplete_Completion_container_pill mx_Autocomplete_Completion_container_truncate">
             {completions}
         </div>;
     }