Ensure Notepad++ has focus when opening a new `.sh` file.

Currently, if you open a `.sh` file after setting `notepad++` as the default application to open `.sh` files with, the `notepad++` window opens and jumps to the front. However, the control is still at the file browser/nautilus. So if you think your in `notepadd++` and press `ctrl+a` and `del` you actually delete all the files in the folder, instead of all the text in the `notepad++` application.

That is considered inconvenient, so ensure `notepad++` is really open and as the attention of the mouse and keyboard when you open a file with it.