Fix copy-paste error in schema tests

Signed-off-by: John Pennycook <john.pennycook@intel.com>

Author: Pennycook

tests/schema/test_schema.py

@@ -178,7 +178,7 @@ def test_cbiconfig_compilers(self):
             include_paths = ["/host/"]
             include_files = ["host.inc"]
 
-            [[compiler.test.modes]]
+            [[compiler.test.passes]]
             name = "device"
             defines = ["DEVICE"]
             include_paths = ["/device/"]