fix: course category was not reflecting on course form

frontend/src/pages/CourseForm.vue

@@ -133,8 +133,8 @@
 								</div>
 								<FormControl
 									v-model="newTag"
-									:placeholder="__('Keywords for the course')"
-									class="w-52"
+									:placeholder="__('Add a keyword and then press enter')"
+									class="w-72"
 									@keyup.enter="updateTags()"
 									id="tags"
 								/>
@@ -288,6 +288,7 @@ const course = reactive({
 	video_link: '',
 	course_image: null,
 	tags: '',
+	category: '',
 	published: false,
 	published_on: '',
 	featured: false,