Update fixturenet-laconicd stack to use alnt denom (#902)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

Reviewed-on: cerc-io/stack-orchestrator#902
Reviewed-by: ashwin <ashwin@noreply.git.vdb.to>
Reviewed-by: David Boreham <dboreham@noreply.git.vdb.to>
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

stack_orchestrator/data/container-build/cerc-laconic-registry-cli/create-demo-records.sh

@@ -14,7 +14,7 @@ funds_balance=$(echo ${funds_response} | jq -r ".[0].balance[0].quantity")
 echo "Balance is: ${funds_balance}"
 
 # Create a bond
-bond_create_result=$(${registry_command} bond create --type photon --quantity 1000000000)
+bond_create_result=$(${registry_command} bond create --type alnt --quantity 1000000000)
 bond_id=$(echo ${bond_create_result} | jq -r .bondId)
 echo "Created bond with id: ${bond_id}"
 

stack_orchestrator/data/container-build/cerc-ping-pub/config/laconic-chaindata-template.json

@@ -7,16 +7,16 @@
     "rpc": [
         {"provider": "LX-tendermint-rpc", "address": "LACONIC_LACONICD_RPC_URL"}
     ],
-    "sdk_version": "0.45.1",
+    "sdk_version": "0.50.3",
     "coin_type": "118",
     "min_tx_fee": "800",
-    "addr_prefix": "ethm",
+    "addr_prefix": "laconic",
     "logo": "/logos/cosmos.svg",
     "assets": [{
-        "base": "photon",
+        "base": "alnt",
         "symbol": "LNT",
-        "exponent": "6",
-        "coingecko_id": "cosmos", 
+        "exponent": "18",
+        "coingecko_id": "cosmos",
         "logo": "/logos/cosmos.svg"
     }]
 }