pdf_generator option has not been patched in

[kehwar]

Chromium install was patched in a while back: #449

However the pdf_generator option is only added on install:

print_designer/print_designer/install.py

Lines 39 to 42 in f22650f

	def after_install():
	create_custom_fields(CUSTOM_FIELDS, ignore_validate=True)
	on_print_designer_install()
	add_pdf_generator_option()

[Rl0007]

Raised PR #483 #484