fixing single character emoji searches retaining the original query

- not entirely sure why this works but replacing the replace with separate delete + insert commands allows the previous query to be fully removed

vector/src/main/java/im/vector/app/features/home/room/detail/AutoCompleter.kt

@@ -194,7 +194,8 @@ class AutoCompleter @AssistedInject constructor(
                         }
 
                         // Replace the word by its completion
-                        editable.replace(startIndex, endIndex, item)
+                        editable.delete(startIndex, endIndex)
+                        editable.insert(startIndex, item)
                         return true
                     }