Update test_xcpp_kernel.py

Author: mcbarton

test/test_xcpp_kernel.py

@@ -267,7 +267,7 @@ def test_xcpp_omp(self):
     kernel_names = ['xcpp17-omp', 'xcpp20-omp', 'xcpp23-omp', 'xc11-omp', 'xc17-omp', 'xc23-omp']
 
     for name in kernel_names:
-        if 'xcpp' in name:
+        if name.startswith('xcpp'):
             language_name = 'C++'
         else:
             language_name = 'c'