Minor changes to test outputs from falco cmdline_options changes

Very minor changes to expected outputs for a couple of tests. These
resulted from falco switching to application + cmdline_options objects

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

test/falco_tests.yaml

@@ -651,7 +651,7 @@ trace_files: !mux
 
   disabled_and_enabled_rules_1:
     exit_status: 1
-    stderr_contains: "Runtime error: You can not specify both disabled .-D/-T. and enabled .-t. rules. Exiting."
+    stderr_contains: "Runtime error: Could not initialize: You can not specify both disabled .-D/-T. and enabled .-t. rules. Exiting."
     disable_tags: [a]
     run_tags: [a]
     rules_file:
@@ -660,7 +660,7 @@ trace_files: !mux
 
   disabled_and_enabled_rules_2:
     exit_status: 1
-    stderr_contains: "Runtime error: You can not specify both disabled .-D/-T. and enabled .-t. rules. Exiting."
+    stderr_contains: "Runtime error: Could not initialize: You can not specify both disabled .-D/-T. and enabled .-t. rules. Exiting."
     disabled_rules:
       - "open.*"
     run_tags: [a]