fix crash

[walmat]

Fixes APP-1611

What changed (plus any additional context for devs)

Screen recordings / screenshots

What to test

[linear[bot]]

APP-1611 Crash when attempting swaps

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/screens/ExchangeModal.tsx

Function	Unhandled Issue
ExchangeModal	TypeError: Cannot read property 'toLowerCase' of undefined usePriceImpactDetails(src/hooks/usePriceImpa... Event Count: 2 Affected Users: 1

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