Update dropshadows to the latest Kolibri Design System guidelines #524

Job	Run time
Path match check	6s
Morango Integration Tests with PostgreSQL	27m 47s
Morango Integration Tests (3.6)	27m 9s
Morango Integration Tests (3.7)	26m 16s
Morango Integration Tests (3.8)	25m 48s
Morango Integration Tests (3.9)	27m 19s
Morango Integration Tests (3.10)	26m 20s
Morango Integration Tests (3.11)	25m 22s
Morango Integration Tests (3.12)	25m 18s
	3h 31m 25s

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