use the official flow icon

[criticalbyte]

the current icon for the .flowconfig file is just an F,
it would be nice to have the official flow icon.
the following is the official png icon.

[PKief]

Thanks a lot, I already had the idea to improve the current icon to look more like the original one. Let's see what I can do here.

[PKief]

I updated the flow icon and it will look like this in the next update:

Thanks