gp-peak: delete 'rm .config' in linux pmaport (MR 1405)

Remove it, to prevent the following error:
	rm: can't remove '.config': No such file or directory

This must have been necessary before, because the prepare script was
different, or abuild did something differently.

device/testing/linux-gp-peak/APKBUILD

@@ -42,7 +42,6 @@ prepare() {
 
 build() {
 	unset LDFLAGS
-	rm .config # Avoid complaints that the source is not clean
 	make ARCH="$_carch" CC="${CC:-gcc}" \
 		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
 }