samples/unlimited: Prevent compile error

For architectures with relatively large minimum stack sizes, this test
breaks during compilation due to a static check. The init task stack
size should not need to be set for this test.

testsuites/samples/unlimited/system.h

@@ -50,7 +50,6 @@ extern void test3(void);
 #define TASK_ALLOCATION_SIZE     (5)
 #define CONFIGURE_UNLIMITED_OBJECTS
 #define CONFIGURE_UNLIMITED_ALLOCATION_SIZE TASK_ALLOCATION_SIZE
-#define CONFIGURE_INIT_TASK_STACK_SIZE (8 * 1024)
 
 
 #include <rtems/confdefs.h>