Fix addCorpus()

[lpatino10]

This PR fixes the addCorpus() method by fixing the way the file is sent to be handled properly by the service.

This fix will be a handwritten one for the immediate future.

[codecov-io]

Codecov Report

Merging #980 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #980      +/-   ##
============================================
- Coverage     40.43%   40.41%   -0.03%     
+ Complexity     1708     1707       -1     
============================================
  Files           646      646              
  Lines         15918    15914       -4     
  Branches        901      901              
============================================
- Hits           6436     6431       -5     
- Misses         9119     9120       +1     
  Partials        363      363

Impacted Files	Coverage Δ	Complexity Δ
...eveloper_cloud/speech_to_text/v1/SpeechToText.java	74.92% <100%> (-0.3%)	47 <0> (ø)
...loud/speech_to_text/v1/model/AddCorpusOptions.java	59.09% <0%> (-2.28%)	5% <0%> (-1%)

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[mediumTaj]

👍 looks good!