fix refs to fkeys in student_program_evaluations (#171)

* program not in this table

* no need to alt this name

Author: rlittle08

models/staging/edfi_3/stage/_edfi_3__stage.yml

@@ -810,9 +810,6 @@ models:
       - name: k_program_evaluation
         tests:
           *ref_k_program_evaluation
-      - name: k_program
-        tests:
-          *ref_k_program
       - name: k_student
         tests:
           *ref_k_student

models/staging/edfi_3/stage/stg_ef3__student_program_evaluations.sql

@@ -9,8 +9,7 @@ keyed as (
         {{ gen_skey("k_student") }},
         {{ gen_skey(
             "k_staff",
-            alt_ref="staff_evaluator_staff_reference",
-            alt_k_name="k_evaluator_staff"
+            alt_ref="staff_evaluator_staff_reference"
         ) }},
         {{ edorg_ref() }},