Fix a logic error in ProjectTeam#fetch_invited_members

We were calling `.where` and `.send` on the relation, but never doing
anything with the return value, resulting in proper access-level
filtering never being of any consequence.

app/models/project_team.rb

@@ -248,9 +248,9 @@ class ProjectTeam
         # group access is developers we need to provide
         # both group master, developers as devs
         if int_level == group_link.group_access
-          im.where("access_level >= ?)", group_link.group_access)
+          im = im.where("access_level >= ?", group_link.group_access)
         else
-          im.send(level)
+          im = im.send(level)
         end
       end

spec/models/project_team_spec.rb

@@ -111,6 +111,7 @@ describe ProjectTeam, models: true do
           group_access: Gitlab::Access::REPORTER
         )
+        expect(project.team.guests).to be_empty
         expect(project.team.reporters).to contain_exactly(group_member.user)
       end
     end