Reorder QML files to follow coding conventions

https://doc.qt.io/qt-5/qml-codingconventions.html#qml-object-declarations

src/gui/Pages/Chat/Composer/Composer.qml

@@ -8,7 +8,6 @@ Rectangle {
     property alias eventList: messageArea.eventList
     readonly property bool hasFocus: messageArea.activeFocus
 
-
     function takeFocus() { messageArea.forceActiveFocus() }
 
 
@@ -17,7 +16,6 @@ Rectangle {
 
     color: theme.chat.composer.background
 
-
     HRowLayout {
         anchors.fill: parent
 

src/gui/Pages/Chat/Composer/MessageArea.qml

@@ -7,7 +7,6 @@ import "../../../Base"
 HTextArea {
     id: textArea
 
-
     property HListView eventList
 
     property string indent: "    "
@@ -50,7 +49,6 @@ HTextArea {
         return obj
     }
 
-
     function setTyping(typing) {
         py.callClientCoro(
             writingUserId, "room_typing", [chat.roomId, typing, 5000],

src/gui/Pages/Chat/Composer/UploadButton.qml

@@ -19,7 +19,6 @@ HButton {
 
     onClicked: sendFilePicker.dialog.open()
 
-
     HShortcut {
         sequences: window.settings.keys.sendFileFromPathInClipboard
         onActivated: utils.sendFile(