fixed ERF creation for JSRUN LM

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (81c2b6e) 44.15% compared to head (d708ce3) 44.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #3096 +/- ## ======================================= Coverage 44.15% 44.15% ======================================= Files 96 96 Lines 10583 10583 ======================================= Hits 4673 4673 Misses 5910 5910 ```

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[mtitov]

We keep JSRUN_ERF outside of the order parameter, thus not to initialize it as a second option to the main JSRUN LM, and if user wants to swap them then this is the way

mkdir -p ~/.radical/pilot/configs
cat > ~/.radical/pilot/configs/resource_ornl.json <<EOF
{
    "summit_jsrun": {
        "launch_methods": {"order": ["JSRUN_ERF"]}
    }
}
EOF