misc: remove unused onFilesToSendCountChanged slot

Change-Id: If0f4c70e4ebec83af1b99da35a8c2d428a2d68c7

src/mainview/components/MessageWebViewFooter.qml

@@ -209,13 +209,6 @@ Rectangle {
             Layout.maximumWidth: JamiTheme.messageWebViewFooterContentMaximumWidth
             Layout.preferredHeight: filesToSendCount ?
                                         JamiTheme.messageWebViewFooterFileContainerPreferredHeight : 0
-
-            onFilesToSendCountChanged: {
-                if (filesToSendCount !== 0)
-                    messageBar.showSendMessageButton()
-                else if (!messageBar.text)
-                    messageBar.hideSendMessageButton()
-            }
         }
     }
 }