Fix: Generates correct media entity operation tags

[irvinesunday]

Issue:
Operation tags for media entity navigation property paths of EntitySet navigation sources don't match their parents' tags e.g. /users/{id}/photo/$value tag is users.user, yet /users/{id}/photo tag is users.profilePhoto.

Fix:
This PR appropriately fixes the condition evaluating whether a media entity path is a navigation property path when creating tags.

Below are a few snippet of the operation tags generated from this fix:

/users({id})/photo/$value:
    get:
      tags:
        - users.profilePhoto
      summary: Get media content for the navigation property photo from users
      operationId: users.GetPhotoContent

/users({id})/contacts({id1})/photo/$value:
    get:
      tags:
        - users.contacts.profilePhoto
      summary: Get media content for the navigation property photo from users
      operationId: users.contacts.GetPhotoContent

/groups({id})/onenote/pages({id1})/content:
    get:
      tags:
        - groups.onenote.onenotePage
      summary: Get media content for the navigation property pages from groups
      operationId: groups.onenote.GetPagesContent

Here's a link to the complete v1.0 OpenAPI doc. generated from this fix: https://microsoft.sharepoint-df.com/:u:/t/GraphTooling/Efkqll2yap9GloX3nPMM38YBcAd-jmAZKG3fQeKIHscghg?e=FKjVHn