[BUG] Fix wrong method name

[leixm]

What changes were proposed in this pull request?

Fix wrong method name.

Why are the changes needed?

Fix wrong method name cause grpc_get_in_memory_shuffle_data_total always 0.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Already exists UT.

[jerqi]

LGTM, thanks @leixm , wait for CI.

[codecov-commenter]

Codecov Report

Merging #335 (6bcbaf6) into master (9f0610a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #335   +/-   ##
=========================================
  Coverage     61.09%   61.09%           
  Complexity     1509     1509           
=========================================
  Files           185      185           
  Lines          9410     9410           
  Branches        918      918           
=========================================
  Hits           5749     5749           
  Misses         3357     3357           
  Partials        304      304           

Impacted Files	Coverage Δ
...pache/uniffle/server/ShuffleServerGrpcService.java	0.83% <ø> (ø)
...pache/uniffle/server/ShuffleServerGrpcMetrics.java	100.00% <100.00%> (ø)

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