[benchmark-shape,hb-shape-threads] Fix argument parsing order

After recent change.

perf/benchmark-shape.cc

@@ -145,8 +145,8 @@ int main(int argc, char** argv)
     for (unsigned i = 0; i < num_tests; i++)
     {
       tests[i].is_variable = true;
-      tests[i].text_path = argv[1 + i * 2];
-      tests[i].font_path = argv[2 + i * 2];
+      tests[i].font_path = argv[1 + i * 2];
+      tests[i].text_path = argv[2 + i * 2];
     }
   }
 

test/threads/hb-shape-threads.cc

@@ -185,8 +185,8 @@ int main(int argc, char** argv)
     for (unsigned i = 0; i < num_tests; i++)
     {
       tests[i].is_variable = true;
-      tests[i].text_path = argv[3 + i * 2];
-      tests[i].font_path = argv[4 + i * 2];
+      tests[i].font_path = argv[3 + i * 2];
+      tests[i].text_path = argv[4 + i * 2];
     }
   }