Remove the local fork

"Fork Locally" ran the selected chain in the browser through
@acala-network/chopsticks-core, which brings its own @polkadot stack
(types, rpc-provider, util-crypto 13 and 14) and @polkadot/wasm-crypto
7.5.4 with the crate versions pezkuwi-wasm 7.5.21 moved off. The app
shipped that second wasm twice, next to ours, for a developer tool;
chopsticks itself stays available from the command line.

Gone: the button, the overlay, the "Local" mock-account modal and the
chopsticks account group, the fork path in the API context, and their
69 locale strings. Mock accounts a fork left in a browser's keyring are
address-only; they now show with the test accounts.

yarn.lock: 32 @polkadot and 2 @acala-network entries -> 0.

packages/react-components/src/util/getAccountCryptoType.ts

@@ -21,9 +21,7 @@ export function getAccountCryptoType (accountId: AccountIdIsh): string {
               ? 'multisig'
               : current.meta.isProxied
                 ? 'proxied'
-                : current.meta.isLocal
-                  ? 'chopsticks'
-                  : 'qr'
+                : 'qr'
             : current.type;
     }
   } catch {