make default token accept default token

[Ho3einWave]

This pull request includes multiple changes to the lib/store/swap.store.ts file, primarily focused on standardizing string quotations and improving code readability.

Standardizing string quotations:

• Changed all double quotes to single quotes in import statements and throughout the file to maintain consistency.
• Updated the ModalState enum to use single quotes instead of double quotes.
• Modified string literals in various methods and type definitions to use single quotes. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22]