LastPass widget flashes at the bottom of page before opening the widget

[srirambv]

Did you search for similar issues before submitting this one?
Yes

Describe the issue you encountered:
Lastpass widget flashes at the bottom of page before opening the widget

Expected behavior:
Should open the widget properly when clicked

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Windows 10 x64, Ubuntu 16.10 (Need to confirm on MAC)
• Brave Version:
  0.12.1 RC1
• Steps to reproduce:
  1. Enable Lastpass as password manager in preferences page
  2. Click on the widget in URL bar
  3. Widget flashes at the bottom of screen before launching it
• Screenshot if needed:
  
• Any related issues:
  #3883

Setting 0.12.2 as milestone