Fix ValueError: setting an array element with a sequence. in diag_shapeselect.py

[schlunma]

Description

Currently, diag_shapeselect.py fails with ValueError: setting an array element with a sequence..

• See Recipe run tests for ESMValCore 2.15.0rc1, 2.15rc3 #4514

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[valeriupredoi]

thanks, Manu! I've seen this one before, thought we'd fixed it - good call 🍺