Fix evaluation count in PyATF search strategies

The search strategies from PyATF are not guaranteed to always give a unique point. It is possible that
`get_next_coordinates` actually returns the same configurations multiple times. However, these should
not count towards the evaluation limit (`max_feval`).

This commit makes it so that only unique configuration evaluations are counted towards the limit.

Author: stijnh

kernel_tuner/strategies/pyatf_strategies.py

@@ -86,7 +86,7 @@ def tune(searchspace: Searchspace, runner, tuning_options):
 
     try:
         # optimization loop (KT-compatible re-implementation of `make_step` from TuningRun)
-        while eval_count < searchspace.size:
+        while len(tuning_options.unique_results) < searchspace.size:
 
             # get new coordinates
             if not coordinates_or_indices: