Military modal focus and military page label contrast hotfixes (#485)

### Requirements List
-

### Description List
- Fixed military modal focus for accessibility
- Fixed military page text contrast

### Testing List
- `yarn test:unit:all` should run without errors or warnings
- `yarn serve` should run without errors or warnings
- `yarn build` should run without errors or warnings
- Smoke test focus change and capture on open military modal
- Confirm contrast issues are fixed
- Code review

Co-authored-by: Dana Stiefel <[email protected]>

Author: ChiefStief

webroot/src/components/Forms/InputButton/InputButton.vue

@@ -10,6 +10,7 @@
         <input
             type="button"
             :id="id"
+            ref="button"
             class="input-button"
             :class="{
                 'no-text-transform': !shouldTransformText,

webroot/src/pages/MilitaryStatus/MilitaryStatus.less

@@ -96,7 +96,7 @@
                 }
 
                 .chunk-title {
-                    color: @darkGrey;
+                    color: @lightTextGrey;
                     font-weight: @fontWeightBold;
                     font-size: 1.4rem;
                 }

webroot/src/pages/MilitaryStatus/MilitaryStatus.ts

@@ -178,6 +178,12 @@ export default class MilitaryStatus extends mixins(MixinForm) {
 
     startEndAffiliationFlow() {
         this.shouldShowEndAffiliationModal = true;
+        this.$nextTick(() => {
+            const buttonComponent = this.$refs.noBackButton as any;
+            const button = buttonComponent.$refs.button as HTMLElement;
+
+            button.focus();
+        });
     }
 
     closeEndAffilifationModal() {

webroot/src/pages/MilitaryStatus/MilitaryStatus.vue

@@ -99,6 +99,7 @@
                         <div class="action-button-row">
                             <InputButton
                                 id="no-back-button"
+                                ref="noBackButton"
                                 class="no-back-button"
                                 :label="backText"
                                 :aria-label="backText"