Fix a weird vertical line in toolbar upon start with no opened tabs

Fixes #3676
Merge pull request #3680 from ussuri/ui-adjustments

Fix a weird vertical line in toolbar upon start with no opened tabs
Revert "Fix a weird vertical line in toolbar upon start with no opened tabs"

This reverts commit 9a97dfaeb506765baf30e1536ea17a3a2d3367a7.
Merge pull request #3682 from ussuri/ui-adjustments

Revert "Fix a weird vertical line in toolbar upon start with no opened tabs"