Fix: check bonus config in crowdloan

[mclyk]

Add more checks when updateBonusconfig.

[mclyk]

@GopherJ pls check this PR, and do you think if we need to ensure start_time>current_time when updating bonus config? like mentioned in this card: https://parallelfi.atlassian.net/browse/BTE-962

[codecov-commenter]

Codecov Report

Base: 58.42% // Head: 58.48% // Increases project coverage by +0.05% :tada:

Coverage data is based on head (86bbb13) compared to base (cf61201). Patch coverage: 96.96% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1901      +/-   ##
==========================================
+ Coverage   58.42%   58.48%   +0.05%     
==========================================
  Files         194      194              
  Lines       19740    19768      +28     
==========================================
+ Hits        11533    11561      +28     
  Misses       8207     8207              

Impacted Files	Coverage Δ
pallets/crowdloans/src/benchmarking.rs	0.00% <ø> (ø)
pallets/streaming/src/lib.rs	83.59% <80.00%> (ø)
pallets/crowdloans/src/lib.rs	68.11% <100.00%> (+0.15%)	:arrow_up:
pallets/crowdloans/src/tests.rs	100.00% <100.00%> (ø)
pallets/crowdloans/src/types.rs	83.33% <100.00%> (+3.33%)	:arrow_up:

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