Bug with `@base` in query when using IRI literal

[Jackamus29]

Describe the bug When querying a subject by it's IRI with @base, it appears that the IRI is not correctly expanded.

To Reproduce

1. Create ledger with data

   {
   "ledger": "base-test",
   "@context": {
   "@base": "https://flur.ee/"
   },
   "insert": [
   {
     "@id": "freddy",
     "@type": "Yeti",
     "name": "Freddy"
   }
   ]
   }

2. Query using @base and IRI literal

   {
   "from": "base-test",
   "@context": {
   "@base": "https://flur.ee/"
   },
   "select": {
   "freddy": [
     "*"
   ]
   }
   }

   =>

   []

3. where+select query with @base and IRI literal

   {
   "from": "base-test",
   "@context": {
   "@base": "https://flur.ee/"
   },
   "where": {
   "@id": "freddy",
   "?p": "?o"
   },
   "select": [
   "?p",
   "?o"
   ]
   }

   =>

   []

Expected behavior The expected results are shown when manually expanding the IRI:

{
  "from": "base-test",
  "@context": {
    "@base": "https://flur.ee/"
  },
  "select": {
    "https://flur.ee/freddy": [
      "*"
    ]
  }
}

=>

[
  {
    "@id": "freddy",
    "@type": "Yeti",
    "name": "Freddy"
  }
]

[Jackamus29]

This issue could be related to https://github.com/fluree/core/issues/53