Fix the export functionality in the pattern editor:
* Fix the export button in the header bar
* Fix the copy to clipboard buttons displaying no text and having a weird styling.
Before:

After:

Fixes#215
Reviewed-on: https://codeberg.org/freesewing/freesewing/pulls/218
Reviewed-by: Joost De Cock <joostdecock@noreply.codeberg.org>
Co-authored-by: Jonathan Haas <haasjona@gmail.com>
Co-committed-by: Jonathan Haas <haasjona@gmail.com>
Refer to the CHANGELOG for all info.
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Co-authored-by: Wouter van Wageningen <wouter.vdub@yahoo.com>
Co-authored-by: Josh Munic <jpmunic@gmail.com>
Co-authored-by: Jonathan Haas <haasjona@gmail.com>