swayimg: remove redundant config file #66979

Job	Run time
Lint templates	42s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	3m 4s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	3m 57s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	2m 49s
Build packages (i686, i686, glibc, linux/386, 1)	2m 47s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	2m 41s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	2m 55s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	3m 39s
	22m 34s

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