Positional parameters with new parser broken

[jvalkeal]

Somehow missed in a new parsing framework but how things should work with positional parameters:

my-shell:>e2e anno option-type-string --arg1 x
Hello x
my-shell:>e2e anno option-type-string x
Hello x

And currently in main branch we get:

my-shell:>e2e anno option-type-string --arg1 x
Hello x
my-shell:>e2e anno option-type-string x
2000E:(pos 0): Missing mandatory option, longnames='arg1', shortnames=''