tdf#123750 gtk3_kde5: Show removable devices in file dialog

Do the same for the gtk3_kde5 VCL plugin as commit
2c69c93f does for the
kde5 one.

Change-Id: I6fc91d1dbe133bd905c033c9fce7d48c0b6464a0
Reviewed-on: https://gerrit.libreoffice.org/71384
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
(cherry picked from commit c08f23b1)
Reviewed-on: https://gerrit.libreoffice.org/71410Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

vcl/unx/gtk3_kde5/kde5_filepicker.cxx

@@ -45,13 +45,10 @@ KDE5FilePicker::KDE5FilePicker(QObject* parent)
     , allowRemoteUrls(false)
 {
     _dialog->setSupportedSchemes({
-        QStringLiteral("file"),
-        QStringLiteral("ftp"),
-        QStringLiteral("http"),
-        QStringLiteral("https"),
-        QStringLiteral("webdav"),
-        QStringLiteral("webdavs"),
+        QStringLiteral("file"), QStringLiteral("ftp"), QStringLiteral("http"),
+        QStringLiteral("https"), QStringLiteral("webdav"), QStringLiteral("webdavs"),
         QStringLiteral("smb"),
+        QStringLiteral(""), // this makes removable devices shown
     });
 
     setMultiSelectionMode(false);