bugfix: fix Etcd3Configuration FILE_CONFIG reference incorrect.

[objcoding]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[zjinlei]

LGTM

[l81893521]

LGTM

[codecov-io]

Codecov Report

Merging #2032 into develop will increase coverage by 0.19%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2032      +/-   ##
=============================================
+ Coverage      54.83%   55.03%   +0.19%     
- Complexity      2472     2474       +2     
=============================================
  Files            444      444              
  Lines          14774    14793      +19     
  Branches        1707     1746      +39     
=============================================
+ Hits            8102     8141      +39     
- Misses          5902     5907       +5     
+ Partials         770      745      -25

Impacted Files	Coverage Δ	Complexity Δ
...java/io/seata/spring/tcc/TccActionInterceptor.java	12.5% <0%> (-0.33%)	2% <0%> (ø)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	25.83% <0%> (-0.22%)	12% <0%> (ø)
...a/io/seata/core/rpc/netty/AbstractRpcRemoting.java	9.64% <0%> (-0.2%)	3% <0%> (ø)
...ing/annotation/GlobalTransactionalInterceptor.java	10% <0%> (-0.15%)	2% <0%> (ø)
...in/java/io/seata/server/session/GlobalSession.java	85.02% <0%> (-0.13%)	68% <0%> (+1%)
...in/java/io/seata/server/session/BranchSession.java	80.45% <0%> (-0.02%)	44% <0%> (ø)
...va/io/seata/core/store/db/LogStoreDataBaseDAO.java	55.44% <0%> (+0.14%)	21% <0%> (ø)	⬇️
...o/seata/server/coordinator/DefaultCoordinator.java	48.41% <0%> (+0.39%)	28% <0%> (+1%)	⬆️
...server/store/file/FileTransactionStoreManager.java	57.46% <0%> (+0.95%)	29% <0%> (ø)	⬇️
...ain/java/io/seata/config/ConfigurationFactory.java	52% <0%> (+0.97%)	3% <0%> (ø)	⬇️
... and 21 more