Remove unwanted padding from TextComponent

This fixes the padding for TextComponent as well, which was needed
post-rich text refactor.

src/messagecontent/TextComponent.qml

@@ -85,6 +85,8 @@ QQC2.TextArea {
 
     ListView.onReused: Qt.binding(() => !hasSpoiler.test(display))
 
+    topPadding: 0
+    bottomPadding: 0
     leftPadding: 0
     rightPadding: 0