Remove redundant arguments for StatItem#isAllowable

[liketic]

Currently, when we check if is allowable in StatItem, we have two unnecessary arguments which are not used in the method. So we can remove them.

[codecov-io]

Codecov Report

Merging #1377 into master will decrease coverage by 0.18%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1377      +/-   ##
==========================================
- Coverage   32.57%   32.39%   -0.19%     
==========================================
  Files         691      691              
  Lines       34537    34537              
  Branches     6812     6812              
==========================================
- Hits        11252    11188      -64     
- Misses      21357    21417      +60     
- Partials     1928     1932       +4

Impacted Files	Coverage Δ
...ava/com/alibaba/dubbo/rpc/filter/tps/StatItem.java	79.16% <ø> (ø)	⬆️
...libaba/dubbo/rpc/filter/tps/DefaultTPSLimiter.java	66.66% <100%> (ø)	⬆️
...ba/dubbo/remoting/transport/netty/NettyClient.java	72.58% <0%> (-11.3%)	⬇️
...mon/serialize/support/dubbo/GenericDataOutput.java	66.31% <0%> (-9.13%)	⬇️
...libaba/com/caucho/hessian/util/IdentityIntMap.java	25% <0%> (-5.96%)	⬇️
...om/alibaba/dubbo/rpc/filter/ActiveLimitFilter.java	83.33% <0%> (-5.56%)	⬇️
...mmon/serialize/support/dubbo/GenericDataInput.java	58.68% <0%> (-5.02%)	⬇️
...a/dubbo/remoting/transport/netty/NettyChannel.java	61.25% <0%> (-5%)	⬇️
...ba/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	⬇️
...main/java/com/alibaba/dubbo/rpc/RpcInvocation.java	15.11% <0%> (-2.33%)	⬇️
... and 2 more

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