[tests] remove redundant univalue_tests.cpp

Author: jnewbery

src/Makefile.test.include

@@ -84,7 +84,6 @@ BITCOIN_TESTS =\
   test/txvalidationcache_tests.cpp \
   test/versionbits_tests.cpp \
   test/uint256_tests.cpp \
-  test/univalue_tests.cpp \
   test/util_tests.cpp
 
 if ENABLE_WALLET