IR framework timeout options expect ms instead of s

The README says:
- `-DTestCompilationTimeout=20`: Change the default waiting time (default: 10s) for a compilation of a normal `@Test` annotated method.
- `-DWaitForCompilationTimeout=20`: Change the default waiting time (default: 10s) for a compilation of a `@Test` annotated method with compilation level [WAIT\_FOR\_COMPILATION](./CompLevel.java).

But both flags expect values in ms.