Align D Testnet (430) and D Mainnet (433) with chains registry

Match the entries submitted to ethereum-lists/chains:
- name "D Testnet" / "D Mainnet"
- shortName "d-testnet" / "d-mainnet"
- icon "d-chain" (dedicated logo, not the shared "dchain" icon)

Author: lampkin-diet

constants/additionalChainRegistry/chainid-430.js

@@ -1,5 +1,5 @@
 export const data = {
-  "name": "Dchain testnet",
+  "name": "D Testnet",
   "chain": "Dchain",
   "rpc": [
     "https://eth-testnet.dfoundation.io"
@@ -12,9 +12,9 @@ export const data = {
   },
   "features": [{ "name": "EIP1559" }],
   "infoURL": "https://dfoundation.io",
-  "shortName": "dchain testnet",
+  "shortName": "d-testnet",
   "chainId": 430,
   "networkId": 430,
-  "icon": "dchain",
+  "icon": "d-chain",
   "explorers": []
 }

constants/additionalChainRegistry/chainid-433.js

@@ -1,5 +1,5 @@
 export const data = {
-  "name": "Dchain mainnet",
+  "name": "D Mainnet",
   "chain": "Dchain",
   "rpc": [
     "https://eth.dfoundation.io"
@@ -12,9 +12,9 @@ export const data = {
   },
   "features": [{ "name": "EIP1559" }],
   "infoURL": "https://dfoundation.io",
-  "shortName": "dchain mainnet",
+  "shortName": "d-mainnet",
   "chainId": 433,
   "networkId": 433,
-  "icon": "dchain",
+  "icon": "d-chain",
   "explorers": []
 }