Change delete project confirmation modal to default size

Default size is `md`

Changelog: changed

app/assets/javascripts/projects/components/shared/delete_button.vue

@@ -104,7 +104,6 @@ export default {
     <gl-modal
       ref="removeModal"
       :modal-id="modalId"
-      size="sm"
       ok-variant="danger"
       footer-class="gl-bg-gray-10 gl-p-5"
       title-class="gl-text-red-500"

ee/spec/frontend/projects/components/__snapshots__/project_adjourned_delete_button_spec.js.snap

@@ -36,7 +36,7 @@ exports[`Project remove modal initialized matches the snapshot 1`] = `
     modalclass=""
     modalid="fakeUniqueId"
     ok-variant="danger"
-    size="sm"
+    size="md"
     title-class="gl-text-red-500"
     titletag="h4"
   >

spec/frontend/projects/components/__snapshots__/project_delete_button_spec.js.snap

@@ -36,7 +36,7 @@ exports[`Project remove modal initialized matches the snapshot 1`] = `
     modalclass=""
     modalid="fakeUniqueId"
     ok-variant="danger"
-    size="sm"
+    size="md"
     title-class="gl-text-red-500"
     titletag="h4"
   >