fix requires registry for main services/components

Was ignoring main when it was in the specifier name,
However we should only ignore if it is in the name AND collection.
This is meant to avoid looking up main twice for example /my-app/src/router/main/main

mu-trees/addon/module-registries/requirejs.js

@@ -36,7 +36,7 @@ export default class RequireJSRegistry {
       segments.push(s.namespace);
     }
 
-    if (s.name !== 'main') {
+    if (s.name !== 'main' || s.collection !== 'main') {
       segments.push(s.name);
     }
 

mu-trees/tests/unit/module-registries/requirejs-test.js

@@ -60,7 +60,7 @@ module('RequireJS Registry', {
 });
 
 test('basic get', function(assert) {
-  assert.expect(8);
+  assert.expect(11);
 
   [
     /*
@@ -74,7 +74,11 @@ test('basic get', function(assert) {
     [ 'template:/my-app/routes/components/my-input', 'my-app/src/ui/components/my-input/template' ],
     [ 'template:/my-app/components/my-input', 'my-app/src/ui/components/my-input/template' ],
     [ 'component:/my-app/components/my-input/my-button', 'my-app/src/ui/components/my-input/my-button/component' ],
-    [ 'template:/my-app/components/my-input/my-button', 'my-app/src/ui/components/my-input/my-button/template' ]
+    [ 'template:/my-app/components/my-input/my-button', 'my-app/src/ui/components/my-input/my-button/template' ],
+    [ 'service:/my-app/services/main', 'my-app/src/services/main' ],
+    [ 'component:/my-app/components/main', 'my-app/src/ui/components/main/component' ],
+    [ 'template:/my-app/components/main', 'my-app/src/ui/components/main/template' ],
+
   ]
   .forEach(([ lookupString, expected ]) => {
     let expectedModule = {};