Remove ctn_OCTOXBPS_SUDO_PARAMS from startPkexec

The call to `WMHelper::getSUCommand()` was reverted back to the string
literal "pkexec", but `ctn_OCTOXBPS_SUDO_PARAMS` was still being
concatenated into `sl` causing an error.

This commit reverts `startPkexec()` back to how it was as of v0.3.0

Author: dexgs

notifier/mainwindow.cpp

@@ -571,7 +571,6 @@ void MainWindow::startPkexec()
   QProcess *xbps = new QProcess();
   connect(xbps, SIGNAL(finished(int)), this, SLOT(finishedPkexec(int)));
   QStringList sl;
-  sl << ctn_OCTOXBPS_SUDO_PARAMS;
   sl << QStringLiteral("/usr/bin/xbps-install");
   sl << QStringLiteral("-Sy");
   xbps->start("pkexec", sl);