Change the logic: Filled icons are the primary ones, not outlined.

[cyntss]

The issue is the following:

All eos-icons are first created in outlined version. Then, when necessary, an outlined version is created. But, this is not always the case because in certain scenarios it makes no sense to create an outlined icon since the filled version is already a line, for example.

The logic in https://github.com/EOS-uiux-Solutions/eos-icons-api/blob/main/src/utils/tools/getSvgCode.ts was created based on the contrary assumption, that icons were first created outlined. This is why we need to change it.

See the conversation below for more background:

[codetheorem]

@cyntss I want to work on this issue?