chore: Call defineChain to ensure chain registration in CUSTOM_CHAIN_MAP (#636)

This commit modifies the `getChain` function in the `chain.ts` file to call the `defineChain` function when a matching chain override is found. This ensures that the chain is registered in the `CUSTOM_CHAIN_MAP` even if a `Chain` type is already available.

Author: d4mr

src/utils/chain.ts

@@ -11,7 +11,9 @@ export const getChain = async (chainId: number): Promise<Chain> => {
 
   for (const override of config.chainOverridesParsed) {
     if (chainId === override.id) {
-      return override;
+      // we need to call defineChain to ensure that the chain is registered in CUSTOM_CHAIN_MAP
+      // even if we have a Chain type, we need to call defineChain to ensure that the chain is registered
+      return defineChain(override);
     }
   }