User Can Be Added to Feed+ Resteem Blacklist Multiple Times

EXPECTED BEHAVIOR

User can only be added to the Resteem Blacklist once.

ACTUAL BEHAVIOR

User can be added to the Resteem Blacklist multiple times.

HOW TO REPRODUCE

1. Login to SteemPlus 2.5.1 on Chrome 65.0.3325.146
2. Go to Steemit.com
3. Follow the @stoodkev account
4. Click on 'Feed+'
5. Expand Resteems Filter
6. Select Blacklist
7. Click 'Add to Resteem Blacklist' on top post multiple times

TESTING ENVIRONMENT

• OS: Windows 10
  
• Browser: Chrome 65.0.3325.146
  
• App Version: 2.5.1
  

RECORDING OF THE BUG