Fix for issue #376: Fix tab highlighting for Single Account navigation

[remain-maomao]

Title: This pull request fixes issue #376 on the end branch by updating the logic in RallyActivity.kt to handle the edge case described in the issue.

Description:
This pull request addresses an issue where the Accounts tab was not highlighted when navigating to a specific single account page in the end version of the code.

Changes Made:

• Updated the logic to determine the current screen by adding a condition that checks if the current route starts with single_account.

val currentScreen = rallyTabRowScreens.find { it.route == currentDestination?.route || (it == Accounts && currentDestination?.route?.startsWith(SingleAccount.route) == true) } ?: Overview

Explanation:
When navigating to a single account, the page's route can be single_account/Checking, single_account/Home Savings, or single_account/Car Savings. These routes do not match the predefined tab routes (overview, accounts, bills), causing the original code to fall back to the Overview page.

The fix adds a condition to highlight the Accounts tab if the current route starts with single_account, ensuring the correct tab is highlighted.

I hope this resolves the issue effectively. If there are any questions or further changes needed, please let me know.