Fix coverage

[zjb0807]

cargo_tarpaulin::process_handling: Args: ["/runner/work/Acala/Acala/target/debug/deps/module_cdp_treasury-f399057a21821dfb", "--test-threads", "16"]

run with --test-threads seems to work fine

[codecov]

Codecov Report

Attention: 118 lines in your changes are missing coverage. Please review.

Comparison is base (7198bb1) 0.00% compared to head (605f135) 67.43%.
Report is 12 commits behind head on master.

Files	Patch %	Lines
modules/xnft/src/xcm_helpers.rs	0.00%	47 Missing ⚠️
modules/xnft/src/impl_transactor.rs	0.00%	44 Missing ⚠️
modules/xnft/src/lib.rs	0.00%	20 Missing ⚠️
modules/honzon/src/lib.rs	53.84%	6 Missing ⚠️
primitives/src/lib.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2658       +/-   ##
===========================================
+ Coverage        0   67.43%   +67.43%     
===========================================
  Files           0       69       +69     
  Lines           0     8175     +8175     
===========================================
+ Hits            0     5513     +5513     
- Misses          0     2662     +2662     

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