"undefined" reporter on type from same module

[elszon]

When tagalign is called on a struct with a member of the type defined in the same module, tagalign reports undefined.

e.g.:
file: a.go

package model

type A struct {
	AA int `json:"aa,omitempty"`
	AB int `json:"ab,omitempty"`
}

file b.go

package model

type B struct {
	BA int `json:"ba,omitempty"`
	AA A   `json:"aa,omitempty"`
}

tagalign called on b.go:

tagalign b.go
-: # command-line-arguments
./b.go:5:5: undefined: A
sandbox/align/internal/model/b.go:5:5: undefined: A
tagalign: 2 errors during loading