DEV: remove all calls to SqlBuilder use DB.build instead

This is part of the migration to mini_sql, SqlBuilder.new is being
deprecated and replaced with DB.build

app/services/badge_granter.rb

@@ -184,7 +184,7 @@ class BadgeGranter
 
     # hack to allow for params, otherwise sanitizer will trigger sprintf
     count_sql = "SELECT COUNT(*) count FROM (#{sql}) q WHERE :backfill = :backfill"
-    grant_count = SqlBuilder.map_exec(OpenStruct, count_sql, params).first.count.to_i
+    grant_count = DB.query_single(count_sql, params).first.to_i
 
     grants_sql =
      if opts[:target_posts]

app/services/user_merger.rb

@@ -386,7 +386,7 @@ class UserMerger
     conditions = Array.wrap(opts[:conditions])
     updates = Array.wrap(opts[:updates])
 
-    builder = SqlBuilder.new(<<~SQL)
+    builder = DB.build(<<~SQL)
       UPDATE #{table_name} AS x
       /*set*/
       WHERE x.#{user_id_column_name} = :source_user_id AND NOT EXISTS(