Tabsheet should be disabled while creating barcodes

[wow-such-code]

Switching from sheet to tube creation or the other way around while one of the two processes is running leads to strange behavior of the progress bar/label. should not be used anyway, so to fix this tab sheet:

barcode-dragon-portlet/src/main/java/life/qbic/portal/portlet/view/BarcodeView.java

Line 129 in 0ef7fcd

tabs = new TabSheet();

should be disabled in this method:
creationPressed()

and enabled in this method:
creationDone()