[IMPROVEMENT] Disable Payment Methods By Default

[sprankhub]

By default, many payment methods are active by default. Examples:

magento2/etc/config.xml

Line 75 in f2ac6c2

<active>1</active>

magento2/etc/config.xml

Line 94 in f2ac6c2

<active>1</active>

magento2/etc/config.xml

Line 113 in f2ac6c2

<active>1</active>

This shouldn't be the case as usually, clients only use a small subset of the available payment methods. Also, when the extension is first configured and the API credentials are entered, still no payment methods should be shown unless I deliberately enable some.