Fix Open Link in Current Tab command

This addresses the issue mentioned in [this](https://github.com/philc/vimium/commit/3a3fe5bf67b085b2807b7afb2d23083541c4e1b0#commitcomment-6126123) comment, introduced by 3a3fe5bf67b085b2807b7afb2d23083541c4e1b0.