Revert change from TextEdit to TextArea

It made some messages unreadabe. We loose proper highlight colors, but
we will have to do for now, until I can figure out, why the TextArea
doesn't work.

resources/qml/MatrixText.qml

 import QtQuick 2.5
 import QtQuick.Controls 2.3
 
-TextArea {
+TextEdit {
 	textFormat: TextEdit.RichText
 	readOnly: true
 	wrapMode: Text.Wrap
 	selectByMouse: true
-	//color: colors.text
-	palette: colors
-
-	padding: 0
+	color: colors.text
 
 	onLinkActivated: {
 		if (/^https:\/\/matrix.to\/#\/(@.*)$/.test(link)) chat.model.openUserProfile(/^https:\/\/matrix.to\/#\/(@.*)$/.exec(link)[1])