[bugfix] fix vault add funds

Found a noticed a bug where we won't track funds in vaults properly, creating several coins of the same asset.

    "block_height": "486",
    "pub_key": "thorpub1addwnpepq29q6v9zwhuv27y7ft4utwlqse23tnq2fj4eh8646q4mk99lpeaa7nnuk8n",
    "coins": [
      {
        "asset": "BNB.LOK-3C0",
        "amount": "0"
      },
      {
        "asset": "BNB.BNB",
        "amount": "0"
      },
      {
        "asset": "BNB.RUNE-A1F",
        "amount": "1646971734855915"
      },
      {
        "asset": "BNB.LOK-3C0",
        "amount": "3840000000"
      },
      {
        "asset": "BNB.LOK-3C0",
        "amount": "7680000000"
      },
      {
        "asset": "BNB.BNB",
        "amount": "34399160"
      },
      {
        "asset": "BNB.LOK-3C0",
        "amount": "5120000000"
      },
      {
        "asset": "BNB.BNB",
        "amount": "51598741"
      },
      {
        "asset": "BNB.BNB",
        "amount": "103197482"
      },
      {
        "asset": "BNB.BNB",
        "amount": "51598741"
      },
      {
        "asset": "BNB.LOK-3C0",
        "amount": "11520000000"
      },
      {
        "asset": "BNB.LOK-3C0",
        "amount": "7680000000"
      },
      {
        "asset": "BNB.BNB",
        "amount": "77398111"
      }
    ],
    "type": "asgard",
    "status": "active",
    "status_since": "486",
    "membership": [
      "thorpub1addwnpepq22g9xg29h6pmrd5l4rv26fepeh6te7q5lge4p69r0mxmfujcz5w6u2jc4f",
      "thorpub1addwnpepqd2w9rf87udcwh0tx5ztyv2q363qt0lcjwuqrg00czyevq5u927avejjlp6",
      "thorpub1addwnpepqdkqde7nxw87jpn2pknx7ceu2f540p58r2t3w3z8j5lqhc2236qfywg7nl7",
      "thorpub1addwnpepqfrf4tnqjyk43p427uxf352ummrpdwgcet4l5v70mh4qkhjnh3dsvs8d9hh",
      "thorpub1addwnpepqtfzh6p73x07sqlzu6gjld2hppudf9vv52nnjt8p3wvcdc6qgxefs3fu6kg",
      "thorpub1addwnpepqthjj4hkr0uhg5468erxnmyqvplfvz6uzg0v0d54f6ekzhj4s2x3jpznk64",
      "thorpub1addwnpepqvjyuvesvhnnv9nug7n2xyph5tpz5lf2hecaye3wfqwxswc6zf3cz5tf55t",
      "thorpub1addwnpepqwk0csz3e0hcpvwjzp27c2mvyss7rgt6cp56xzhmr5h0wggg8y9j7uxmtz7"
    ]
  }