test_snapshot_ab: rename guest_kernel_acpi to guest_kernel

This was the result of a find and replace gone awry it seems.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/performance/test_snapshot_ab.py

@@ -43,12 +43,12 @@ def id(self):
     def configure_vm(
         self,
         microvm_factory,
-        guest_kernel_acpi,
+        guest_kernel,
         rootfs,
     ) -> Microvm:
         """Creates the initial snapshot that will be loaded repeatedly to sample latencies"""
         vm = microvm_factory.build(
-            guest_kernel_acpi,
+            guest_kernel,
             rootfs,
             monitor_memory=False,
         )