fix: Fix pascal enum reference

[sschw]

Generating enums using the useEnums option will generate the enum types with pascal(name), however when referencing the enum type, the name is not formatted.

This causes issues with lowerCamelCase names.

Wrapping name || "" inside a pascal solves issues with lowerCamelCase names.

[fabien0102]

Can you add a unit test to demonstrate the issue? I'm not sure I see what you are fixing 🤔

[sschw]

Sure, I added a test to schemaToTypeAliasDeclaration.test.ts.
It can easily be tested by changing "Test" to "test" in the printSchema function in schemaToEnumDeclaration.test.ts and schemaToTypeAliasDeclaration.test.ts.
While schemaToEnumDeclaration is still working as intended, the enum tests in schemaToTypeAliasDeclaration was failing.

I also added a test to schemaToEnumDeclaration.test.ts, just so that this case is tested there as well.

[sschw]

@fabien0102 Rebased this PR and solved the conflicts as jest update changed the snapshots.