Make setup show external DB parameters automaticaly when selecting postgres

Before, the "external postgres" options were not shown, even though
"extrnal" was pre-selected. This fixes the mechanics surrounding the
picker.

setup/static/render.js

@@ -51,7 +51,12 @@ $(document).ready(function() {
 		} else if (this.value == 'postgresql') {
 			$("#postgres_db").show();
 			$("#external_db").hide();
-			$("#external_db").prop('checked', false);
+			$("#external_psql").prop('checked', true);
+			$("#external_db").show();
+			$("#db_user").prop('required',true);
+			$("#db_pw").prop('required',true);
+			$("#db_url").prop('required',true);
+			$("#db_name").prop('required',true);
 		} else if (this.value == 'mysql') {
 			$("#postgres_db").hide();
 			$("#external_db").show();

setup/templates/steps/database.html

@@ -20,7 +20,7 @@
 			</label>
 		</div>
 		<div class="form-check">
-			<input class="form-check-input" type="radio" name="postgresql" value="external" id="external_psql" checked>
+			<input class="form-check-input" type="radio" name="postgresql" value="external" id="external_psql">
 			<label class="form-check-label" for="external_psql">
 				I want to connect to an external database
 			</label>