testsuite: fix issue 1035 test

Problem: t1035-fluxion-reload currently unloads Fluxion and qmanager
before updating the configuration. In the build environment Flux only
loads sched-simple by default, so unloading sched-fluxion-qmanager and
sched-fluxion-resource throws an error.

Remove default-loaded sched-simple to prevent the error.

Author: milroy

t/issues/t1035-fluxion-reload.sh

@@ -16,8 +16,7 @@ fi
 test $(flux resource list -no {nnodes}) -eq 4 || die "test requires 4 nodes"
 
 log "Unloading modules..."
-flux module remove sched-fluxion-qmanager
-flux module remove sched-fluxion-resource
+flux module remove sched-simple
 flux module remove resource
 
 log "Amending instance resource set with properties: batch, debug..."