94031: Fix findById for concat fields

As far as I can tell the suffix is never used with a numeric part, causing this branch to always miss concat group fields

Author: ybnd

src/app/shared/form/builder/form-builder.service.spec.ts

@@ -325,6 +325,14 @@ describe('FormBuilderService test suite', () => {
           typeBindRelations: [{ match: 'VISIBLE', operator: 'OR', when: [{id: 'dc.type', value: 'Book' }]}]
         },
       ),
+
+      new DynamicConcatModel({
+        id: 'testConcatGroup_CONCAT_GROUP',
+        group: [
+          new DynamicInputModel({ id: 'testConcatGroup_CONCAT_FIRST_INPUT' }),
+          new DynamicInputModel({ id: 'testConcatGroup_CONCAT_SECOND_INPUT' }),
+        ]
+      } as any)
     ];
 
     testFormConfiguration = {
@@ -463,6 +471,7 @@ describe('FormBuilderService test suite', () => {
     expect(service.findById('testTimePicker', testModel) instanceof DynamicTimePickerModel).toBe(true);
     expect(service.findById('testRating', testModel) instanceof DynamicRatingModel).toBe(true);
     expect(service.findById('testColorPicker', testModel) instanceof DynamicColorPickerModel).toBe(true);
+    expect(service.findById('testConcatGroup', testModel) instanceof DynamicConcatModel).toBe(true);
   });
 
   it('should find a nested dynamic form control model by id', () => {

src/app/shared/form/builder/form-builder.service.ts

@@ -116,8 +116,8 @@ export class FormBuilderService extends DynamicFormService {
         }
 
         if (this.isConcatGroup(controlModel)) {
-          if (controlModel.id.match(new RegExp(findId + CONCAT_GROUP_SUFFIX + `_\\d+$`))) {
-            result = (controlModel as DynamicConcatModel).group[0];
+          if (controlModel.id.match(new RegExp(findId + CONCAT_GROUP_SUFFIX))) {
+            result = (controlModel as DynamicConcatModel);
             break;
           }
         }