fix: Change default columns to remove total and add amount for expense report view

[RanuK12]

Details

Changes the default columns shown in the expense report view to use the inline-editable amount column instead of the non-editable total column.

Fixed Issues

Closes Expensify#93014

Tests

1. Open an expense report - the amount column should be visible by default
2. If the report has transactions in a different currency, both amount and total columns should be visible
3. Verify the total column is not shown by default unless there are multi-currency transactions

QA Steps

1. Navigate to any expense report
2. Verify the amount column is shown (not the total column)
3. If the report contains expenses in a different currency from the workspace currency, verify both amount and total columns appear

Criterios de aceptación cubiertos

1. ✅ Amount column shown by default: Changed TYPE_DEFAULT_COLUMNS.EXPENSE_REPORT in CONST/index.ts from TABLE_COLUMNS.TOTAL to TABLE_COLUMNS.TOTAL_AMOUNT
2. ✅ Keep showing both when multi-currency: Updated getColumnsToShow in SearchUIUtils.ts to add TABLE_COLUMNS.TOTAL (instead of TOTAL_AMOUNT) when an exchange rate exists, so both columns are visible when needed