use already-set credit value as initial value in audit stepper

src/app/dars/new-degree-audit-dialog/new-degree-audit-dialog.component.ts

@@ -127,7 +127,7 @@ export class NewDegreeAuditDialogComponent implements OnInit {
         this.chosenCreditSettings.push(
           this.fb.group({
             course,
-            credits: this.fb.control('', Validators.required),
+            credits: this.fb.control(course.credits || '', Validators.required),
           }),
         );
       });

src/app/dars/new-what-if-audit-dialog/new-what-if-audit-dialog.component.ts

@@ -150,7 +150,7 @@ export class NewWhatIfAuditDialogComponent implements OnInit {
         this.chosenCreditSettings.push(
           this.fb.group({
             course,
-            credits: this.fb.control('', Validators.required),
+            credits: this.fb.control(course.credits || '', Validators.required),
           }),
         );
       });