Fix test compilation on main: remove duplicate testAvailableAfterEmptyBlock

[yawkat]

main currently fails to compile its tests, and the "Run tests" workflow has been failing since c8ebf97:

LZ4BlockStreamingTest.java:[607,15] method testAvailableAfterEmptyBlock() is already defined in class LZ4BlockStreamingTest

#129 and c8ebf97 each added a testAvailableAfterEmptyBlock test, and both check that available() is 0 after the terminating empty block. This PR keeps the copy from #129, which covers both stopOnEmptyBlock settings, and removes the later one.

There are no other conflicts between these merges. LZ4BlockInputStream resets o = 0 only once in the empty-block branch, and the full suite passes:

./mvnw -B test   (JDK 7 toolchain, target 1.7)
Tests run: 3891, Failures: 0, Errors: 0, Skipped: 52

🤖 Generated with Claude Code

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.76%. Comparing base (2acc0ec) to head (c446f2d).
⚠️ Report is 3 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #149      +/-   ##
============================================
+ Coverage     79.14%   79.76%   +0.61%     
- Complexity      555      562       +7     
============================================
  Files            42       42              
  Lines          1841     1838       -3     
  Branches        251      247       -4     
============================================
+ Hits           1457     1466       +9     
+ Misses          247      239       -8     
+ Partials        137      133       -4     

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