Casper Signer | Extension's window size is not restored after it was enlarged due to long list of connected sites

[karatnyk]

Pre-condition:
11 or more websites connected to Casper Signer extension

Steps to reproduce:

1. Open Casper Signer extension
2. Observe extension's window default size
3. Unlock the vault
4. Navigate to 'Menu' -> 'Connected sites'
5. Observe that extension's window size got bigger
6. Lock the vault

Expected result: Extension's window size is restored
Actual result: Extension's window size is not restored. UI elements are misaligned.