GMM: Add 1500 to site class dropdown.

Resolves #218 (closed).

Use new GMM multi param component.

projects/nshmp-apps/src/app/dev/gmm/hanging-wall-effects/components/control-panel/control-panel.component.html

@@ -4,14 +4,9 @@
   [formGroup]="formState"
   (submit)="onSubmit()"
 >
-  <mat-form-field class="grid-col-12 multi-select-parameter-menu padding-top-1">
-    <mat-label>Multi-Selectable Parameter</mat-label>
-    <mat-select [formControl]="formState.controls.multiSelectableParam">
-      <mat-option value="gmm">Ground Motion Models</mat-option>
-      <mat-option value="Mw">M<sub>W</sub></mat-option>
-      <mat-option value="vs30">V<sub>S30</sub></mat-option>
-    </mat-select>
-  </mat-form-field>
+  <nshmp-lib-ng-gmm-multi-param-menu
+    [multiParamControl]="controls.multiSelectableParam"
+  />
 
   <!-- GMM menu -->
   @if (parameters()) {