Adding prompt arguments for Phi3v on MathVista-TestMini

Author: vfragoso

Diff for: lmms_eval/tasks/mathvista/mathvista_testmini.yaml

@@ -20,10 +20,12 @@ metric_list:
   - metric: gpt_eval_score
     aggregation: !function utils.mathvista_aggregate_results
     higher_is_better: true
-  
+
 model_specific_prompt_kwargs:
   default:
     shot_type: "format-prompt" # can be "reason-first", "solution", "step-by-step"
+  phi3v:
+    shot_type: "solution"
 model_specific_generation_kwargs:
   llava:
     image_aspect_ratio: original