Fix another windows specific test snapshot

Author: gaborcsardi

tests/testthat/_snaps/utils.md

@@ -4,15 +4,15 @@
       full_path("//")
     Condition
       Error:
-      ! Server name not found in network path.
+      ! ! Server name not found in network path.
     Code
       full_path("///")
     Condition
       Error:
-      ! Server name not found in network path.
+      ! ! Server name not found in network path.
     Code
       full_path("///a")
     Condition
       Error:
-      ! Server name not found in network path.
+      ! ! Server name not found in network path.