remove unused imports

Signed-off-by: sowjanyakch <sowjanya.kch@gmail.com>

app/src/main/java/com/nextcloud/talk/api/NcApi.java

@@ -393,12 +393,6 @@ public interface NcApi {
                                                     @Url String url,
                                                     @Field("level") int level);
 
-    @FormUrlEncoded
-    @PUT
-    Observable<GenericOverall> setConversationReadOnly(@Header("Authorization") String authorization,
-                                                @Url String url,
-                                                @Field("state") int state);
-
     @FormUrlEncoded
     @POST
     Observable<GenericOverall> createRemoteShare(@Nullable @Header("Authorization") String authorization,