[build-base-plans.sh] Move rust below busybox-static due to dependency.
[build-base-plans.sh] Move rust below busybox-static due to dependency.

This change moves the build order of rust to be below the busybox-static
pacakge as rust uses busybox-static for a wrapping shell script around
cargo.

Signed-off-by: Fletcher Nichol <77a0fd9e8048bbacd11af4e957bc6ff03b549f49@nichol.ca>

be-plans/be,be-plans/be,be-plans/be,be-plans/be