fix(account-sdk): remove broken require export conditions

[mehmetkr-31]

Summary

Removes broken and misleading require condition keys from package.json exports.

Problem

The @base-org/account package declares "type": "module" (ESM-only), but its package.json exports field advertised require keys resolving to ESM .js files (like ./dist/index.js and ./dist/index.node.js).

Because the package is ESM, Node.js parses these resolved files as ES modules even when resolved via require(). This causes CommonJS consumers attempting to import the SDK to hit ERR_REQUIRE_ESM at runtime.

Solution

Remove the unsupported require conditions from the exports mappings. This aligns the exports field with the ESM-only nature of the package and prevents misleading auto-resolution errors for CommonJS consumers.

Fixes #315

[cb-heimdall]

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