Revert "mathutil: error instead of infinite loop if triangulation failed"

This reverts commit 9c4cb28805edf550fac9d8f4f87e568bbbf9a154.

The "fix" wasn't very satisfying, I'm going to try another approach.

panda/src/mathutil/triangulator.cxx

@@ -150,11 +150,7 @@ triangulate() {
   }
   */
 
-  int attempts = 0;
-
   while (construct_trapezoids(num_segments) != 0) {
-    nassertv_always(attempts++ < 100);
-
     // If there's an error, re-shuffle the index and try again.
     Randomizer randomizer;
     for (i = 0; i < num_segments; ++i) {