oasis-test-runner: Enable sgx_loader in client node

[matevz]

Needed by https://github.com/oasisprotocol/oasis-web3-gateway/pull/625

[netlify[bot]]

✅ Deploy Preview for oasisprotocol-oasis-core canceled.

Name	Link
🔨 Latest commit	ea33628fedd4539165c0bf62ad6a2ccbea91f7c3
🔍 Latest deploy log	https://app.netlify.com/sites/oasisprotocol-oasis-core/deploys/66f57ab62a7cf70008173500

[codecov[bot]]

Codecov Report

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

Project coverage is 65.07%. Comparing base (28736a2) to head (e552937). Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5868      +/-   ##
==========================================
+ Coverage   64.93%   65.07%   +0.14%     
==========================================
  Files         622      624       +2     
  Lines       63492    63724     +232     
==========================================
+ Hits        41229    41470     +241     
+ Misses      17379    17369      -10     
- Partials     4884     4885       +1     

Flag	Coverage Δ
	65.07% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[matevz]

Since we won't be running ROFLs on the client nodes on sapphire-localnet yet I think there is no need for this PR anymore.

[kostko]

Still makes sense to do it?