tests/Database_test.cpp: fix a warning around #endif (#489)

Without the change `gcc` detects unexpected tokens as:

/build/source/tests/Database_test.cpp:566:9: warning: extra tokens at
end of #endif directive
[8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wendif-labels-Wendif-labels8;;]
      566 | #endif  && !defined(__APPLE__)
          |         ^~

Author: SRombauts

tests/Database_test.cpp

@@ -563,7 +563,7 @@ TEST(Database, getHeaderInfo)
 // NOTE on macOS FindSQLite3 find an unrelated sqlite3.h from Mono.framework that doesn't match the actual package version!
 #if defined(SQLITECPP_INTERNAL_SQLITE) || !defined(__APPLE__)
         EXPECT_EQ(h.sqliteVersion, SQLITE_VERSION_NUMBER);
-#endif  && !defined(__APPLE__)
+#endif
     }
     remove("test.db3");
 }