Update alg_growth_3rd_gh_reply_video_v1: use first uv as score denominator

alg_growth_3rd_gh_reply_video_v1.py

@@ -104,7 +104,7 @@ def process_reply_stats(project, table, period, run_dt):
 
     merged_df = pd.concat([df, default_stats_df]).reset_index(drop=True)
 
-    merged_df['score'] = merged_df['day0_return'] / (merged_df['send_count'] + 500)
+    merged_df['score'] = merged_df['day0_return'] / (merged_df['first_visit_uv'] + 100)
     return merged_df