runtime-sdk: Permanently enable schedule control

[kostko]

Given upcoming oasisprotocol/oasis-core#4665 which will mandate runtime schedule control, this makes schedule control always enabled.

[codecov]

Codecov Report

Merging #888 (8a633e7) into main (e2d9753) will decrease coverage by 0.35%.
The diff coverage is 11.90%.

@@            Coverage Diff             @@
##             main     #888      +/-   ##
==========================================
- Coverage   70.65%   70.29%   -0.36%     
==========================================
  Files         118      119       +1     
  Lines        9309     9228      -81     
==========================================
- Hits         6577     6487      -90     
- Misses       2709     2718       +9     
  Partials       23       23              

Impacted Files	Coverage Δ
runtime-sdk/src/config.rs	0.00% <0.00%> (ø)
runtime-sdk/src/module.rs	46.20% <0.00%> (-2.25%)	⬇️
runtime-sdk/src/modules/core/mod.rs	78.50% <0.00%> (-2.26%)	⬇️
runtime-sdk/src/modules/core/test.rs	96.00% <0.00%> (-1.00%)	⬇️
runtime-sdk/src/runtime.rs	18.18% <0.00%> (+0.27%)	⬆️
runtime-sdk/src/dispatcher.rs	12.37% <18.51%> (-1.05%)	⬇️

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