duplicate decrease for ExecuteLimitFilter onError

[chickenlj]

What is the purpose of the change

Related to #4276

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #4380 into 2.7.3-release will decrease coverage by 0.01%.
The diff coverage is 42.85%.

@@                 Coverage Diff                 @@
##             2.7.3-release    #4380      +/-   ##
===================================================
- Coverage            62.87%   62.85%   -0.02%     
+ Complexity             505      502       -3     
===================================================
  Files                  769      769              
  Lines                32995    33007      +12     
  Branches              5215     5219       +4     
===================================================
+ Hits                 20746    20747       +1     
- Misses                9844     9850       +6     
- Partials              2405     2410       +5

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/apache/dubbo/rpc/RpcException.java	83.33% <0%> (+0.57%)	0 <0> (ø)	⬇️
...org/apache/dubbo/rpc/filter/ActiveLimitFilter.java	88% <42.85%> (-7.46%)	0 <0> (ø)
...rg/apache/dubbo/rpc/filter/ExecuteLimitFilter.java	69.23% <50%> (-6.96%)	0 <0> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	54.11% <0%> (-8.24%)	19% <0%> (-2%)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	67.21% <0%> (-3.28%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	65.09% <0%> (-1.89%)	0% <0%> (ø)
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.15% <0%> (-0.29%)	31% <0%> (-1%)
...he/dubbo/registry/multicast/MulticastRegistry.java	69.23% <0%> (+1.35%)	0% <0%> (ø)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	81.6% <0%> (+1.53%)	0% <0%> (ø)	⬇️
... and 1 more

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[shawnchain]

后面这个类型检测要来干嘛？