myrialang: switch from removing all stores to removing inner stores
myrialang: switch from removing all stores to removing inner stores

The former was a Datalog chaining workaround, which needs to be slightly
revised now that we can actually generate plans with stores we want to keep in
them.

Signed-off-by: Daniel Halperin <1a02732a15f637c31107256cbee5819e36aa7c67@cs.washington.edu>

uwescience/raco,uwescience/raco,uwescience/raco,uwescience/raco,uwescience/raco