Fix the unknown option in valgrind

Add memcheck in front of show-leak-kinds

While using massif in valgrind, like below
```
valgrind --tool=massif ./qtest
```

It would return `Unknown option: --show-leak-kinds=all`
In fact, the option `show-leak-kinds` should be called in `memcheck`
Just like `memcheck:leak-check=full`

Author: ZhuMon

.valgrindrc

@@ -1,4 +1,4 @@
 --quiet
 --memcheck:leak-check=full
---show-leak-kinds=all
+--memcheck:show-leak-kinds=all
 --error-exitcode=1