Make the PDF text layer non-renderable by default.

services/web/public/stylesheets/app/editor/pdf.less

@@ -352,3 +352,13 @@
 	.files-dropdown {
 		display: inline-block;
 	}
+
+.plv-text-layer {
+	display: none;
+	& > div {
+		color: red;
+	}
+	&.plv-text-layer-visible {
+		display: block;
+	}
+}