pmbootstrap tries to install both initramfs and -minimal when editing both

Not sure if this is a regression in pmbv3, but I've observed it there:

make changes to both postmarketos-initramfs-minimal and postmarketos-initramfs
install a device that depends on postmarketos-initramfs, like samsung-i9100
pmbootstrap will build both packages during pmbootstrap install, and also try to install both packages, which results in a conflict error

Instead it should only build and try to isntall postmarketos-initramfs-minimal.

I've seen this with pmaports!5609.

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