(improvement) Balance change representation

[alexstotsky]

Task: https://app.asana.com/0/1163495710802945/1205968599642845/f

Description:

• Improves Balance Change representation in the Summary by Asset section according to the following proposals:

- Hide 0% on balance change if the balance was previously 0 e.g. 
EUR was 0 and then it was deposited all current amount balance 432 balance change is also 432, 
it is confusing for users to have a percentage balance change 0% simply should be removed 

- If the balance change is 0$, then 0% should stay

Before:

After:

[ezewer]

looks good to me!