fix: fix convertamount format

[asbiin]

Amount must ALWAYS be saved as integer.
In this case, converted_amount is also render later using MoneyHelper::format() which take the amount as an integer.

Notes:

• the migration in 2021_07_13_164157_fix_expense_converted_amount.php use a change() which does not work on sqlite (it locks the table!)
• that's why I've updated the columns in 2020_06_30_211833_create_expenses_table.php also: it will apply for sqlite, or new installation, which is fine, and the migration will not apply to existing installation, which is fine too (the 2nd migration will fix it)

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[djaiss]

Good job!

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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100.0% Coverage
0.0% Duplication

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