tests: timer: Change name of test

Change the name of the test to be unique.  Otherwise, twister just
aborts with a duplicate test error.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

tests/timer/testcase.yaml

@@ -9,7 +9,7 @@ common:
     - qemu_riscv64/qemu_virt_riscv64/smp
     - nrf52840dk/nrf52840
 tests:
-  test.rust.time:
+  test.rust.timer:
     harness: console
     harness_config:
       type: one_line