Add Digitus DN-19 07-U (#3275)

* feat: add Digitus DN-19 07-U

* fix: add missing desc_units property

Author: bastianleicht

rack-types/Digitus/DN-19-07-U.yml

@@ -0,0 +1,16 @@
+---
+manufacturer: Digitus
+model: DN-19 07-U
+slug: digitus-dn-19-07-u
+form_factor: wall-cabinet
+description: 7HE Wall Mounted Cabinet [Datasheet DE](https://www.assmann.com/product-pdf/4016032135203?PL=de)
+width: 19
+u_height: 7
+starting_unit: 1
+outer_width: 600
+outer_unit: mm
+mounting_depth: 450
+weight: 18
+max_weight: 100
+weight_unit: kg
+desc_units: false