feat: allow to find users with access to a project more freely

Related to https://kolaente.dev/vikunja/frontend/issues/2196

pkg/models/user_project.go

@@ -105,6 +105,7 @@ func ListUsersFromProject(s *xorm.Session, l *Project, search string) (users []*
 	users, err = user.ListUsers(s, search, &user.ProjectUserOpts{
 		AdditionalCond:              cond,
 		ReturnAllIfNoSearchProvided: true,
+		MatchFuzzily:                true,
 	})
 	return
 }