qml: add default topPadding to ElTextArea

I noticed all ElTextAreas seem to look better with some topPadding,
so it makes more sense to add it as default to ElTextArea.
Followup to https://github.com/spesmilo/electrum/pull/10579

electrum/gui/qml/components/NostrConfigDialog.qml

@@ -74,7 +74,6 @@ ElDialog {
                     Layout.fillWidth: true
                     Layout.fillHeight: true
                     font.family: FixedFont
-                    topPadding: constants.paddingLarge
                     wrapMode: TextEdit.WrapAnywhere
                     onTextChanged: valid = verify(text)
                     inputMethodHints: Qt.ImhSensitiveData | Qt.ImhNoPredictiveText | Qt.ImhNoAutoUppercase

electrum/gui/qml/components/controls/ElTextArea.qml

@@ -49,6 +49,7 @@ Flickable {
         width: root.width
         height: Math.max(root.height, edit.height + topPadding + bottomPadding)
         padding: constants.paddingXSmall
+        topPadding: constants.paddingLarge
         TextArea {
             id: edit
             width: parent.width