[gardening] Fix 'debugger()' line expectations in tests.

Follow-up to bbdf87d.
TEST=ci

Change-Id: I3198698cd6df8a917fa676b6ff42b72cb645949e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/311141
Commit-Queue: Alexander Aprelev <[email protected]>
Reviewed-by: Ryan Macnak <[email protected]>

Author: aam

pkg/vm_service/test/get_instances_as_list_rpc_test.dart

@@ -62,7 +62,7 @@ IsolateTest createTestThatExpectsInstanceCounts(
 
 final tests = <IsolateTest>[
   hasStoppedAtBreakpoint,
-  stoppedAtLine(25),
+  stoppedAtLine(24),
   createTestThatExpectsInstanceCounts(0, 0, 0),
   resumeIsolate,
   createTestThatExpectsInstanceCounts(1, 2, 3),

pkg/vm_service/test/get_instances_rpc_test.dart

@@ -63,7 +63,7 @@ IsolateTest createTestThatExpectsInstanceCounts(
 
 final tests = <IsolateTest>[
   hasStoppedAtBreakpoint,
-  stoppedAtLine(25),
+  stoppedAtLine(24),
   createTestThatExpectsInstanceCounts(0, 0, 0),
   resumeIsolate,
   createTestThatExpectsInstanceCounts(1, 2, 3),