ENH: Unlink the overall SED amplitude from the stellar mass

[WillHartley]

Description

The k-correct stellar mass (formed) provides a convenient way to quantify the SED amplitude, as it depends directly on the mass. However, making this assumption in SkyPy prevents us from adding template SED sets that do not follow the same convention. We should remove the current explicit dependence to introduce flexibility. This will also allow us to set the remianing stellar mass as the default stellar mass option in the k-correct template set.

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