fix: pair logger.timeEnd for 'updating tokens cache' in useTokens

The third logger.time call in updateTokensBalances was never ended,
causing repeated "Timer 'updating tokens cache' already exists" warnings
on every recompute of the useMemo that wraps the function.

Closes #467

Author: gabitoesmiapodo

src/hooks/useTokens.ts

@@ -226,6 +226,7 @@ export function updateTokensBalances(
     },
     {} as TokensMap['tokensByChainId'],
   )
+  logger.timeEnd('updating tokens cache')
 
   return { tokens: tokensWithBalances, tokensByChainId: tokensByChain }
 }