fix(netlify-cms-core): fix identifier field validation #1907
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Describe the bug
Follow-on to #1543 and #1878. Attempting to use the identifier_field feature introduced in 2.2.0 with an identifier that is not all lowercase causes the backend (On Save) error: 'Collection must have a field name that is a valid entry identifier, or must have
identifier_field
set'.To Reproduce
Specify an identifier_field that has uppercase characters and then attempt to create and save an entry.
Expected behavior
The CMS saves without throwing an error.
Minor Refactor
Also fix spelling of local variable in the
selectIdentifier
function.