Set VirSorter2 preemptible_tries to 0 (always on-demand)

VS2 is a long-running Snakemake workflow; preemption wastes the full
restart cost including the micromamba install step. On-demand avoids
the wasted first attempt.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tpshea2

wdl/tasks/Viral/VirSorter2.wdl

@@ -163,7 +163,7 @@ PYEOF
         mem_gb:             32,
         disk_gb:            disk_size,
         boot_disk_gb:       25,
-        preemptible_tries:  1,
+        preemptible_tries:  0,
         max_retries:        1,
         docker:             "ghcr.io/broadinstitute/hvp-lr/hvp-monolith:0.0.3"
     }