EncodingLevel 2 mistakenly put in as minimal

[frosterus]

When converting LDR/17 to bf:EncodingLevel, value "2" is interpreted as "minimal" when it should be "Less-than-full level, material not examined" according to https://www.loc.gov/marc/bibliographic/bdleader.html.
We note that this is missing from here https://id.loc.gov/vocabulary/menclvl.html so might not be in use at LC.

We use this value in our data.

Relevant part of the conversion rules:
2 - Less-than-full level, material not examined | W - adminMetadata - AdminMetadata - bflc:encodingLevel - bflc:EncodingLevel - http://id.loc.gov/vocabulary/menclvl/7 ; add rdfs:label "minimal"