runtime-sdk: Always rollback any changes to storage from queries

[kostko]

Note that in practice this is a no-op as Oasis Core will perform the rollback in any case. This just makes it explicit.

[codecov]

Codecov Report

Merging #1460 (8a8d511) into main (c450763) will decrease coverage by 1.41%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1460      +/-   ##
==========================================
- Coverage   57.74%   56.34%   -1.41%     
==========================================
  Files         136      136              
  Lines        9767     9749      -18     
==========================================
- Hits         5640     5493     -147     
- Misses       4085     4214     +129     
  Partials       42       42              

Files Changed	Coverage Δ
runtime-sdk/src/dispatcher.rs	18.50% <100.00%> (+0.42%)	⬆️

... and 2 files with indirect coverage changes

[peternose]

Note that in practice this is a no-op as Oasis Core will perform the rollback in any case. This just makes it explicit.

I would add this as a comment, but saying that this is probably a no-op (as we can change the core code in the future).