Affinity: Use correct font size (used for posts, not pages) in the editor.

affinity/editor-blocks.css

@@ -23,7 +23,7 @@
 .edit-post-visual-editor .editor-block-list__block p:not(.wp-block-cover-text),
 .editor-default-block-appender input[type="text"].editor-default-block-appender__content {
 	color: #5e5853;
-	font-size: 18px;
+	font-size: 16px;
 	font-family: Lora, Baskerville, Georgia, Times, serif;
 	line-height: 1.6;
 }