Routes found when exceeded assets value is entered

[VolodLytvynenko]

Steps:

1. Go to sent assets page
2. Enter an available value that the user has.
3. Quickly change it while routes searching process is performed to exceed the value (example: user has 1 ETH, user enters 0.1, then updates it quickly to 2).

Actual Result:

The routes are found.

routes.mp4

Expected Result:
The routes should not be found when the exceeded assets value is entered.