Refresh recipe tree upon save

[cydanil]

Description

Fix updating of the main window when a new recipe is added.
Whilst all information was saved, not all information was loaded, and displayed "broken" recipes.
One had to restart the application to be able to browse the newly added recipe.

Closes #344.

How Has This Been Tested?

• Saving a new recipe whilst on the first page;
• Browsing to the last page:
  • The title is updated;
  • The image is displayed;
  • The rating is correct;
• Opening the recipe displays all information updated and correct.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.