Always display the horizontal scroll bar when log word wrap is off

Otherwise, a line that's too wide for the log widget will cause the horizontal scroll bar to appear, which reduces the vertical height, and causes the most recent line to be off screen.  Since that line is off screen, the log widget no longer scrolls as new lines appear, unless it's manually scrolled to the very bottom again.

Source/Core/DolphinQt/Config/LogWidget.cpp

@@ -184,6 +184,8 @@ void LogWidget::LoadSettings()
   m_log_wrap->setChecked(settings.value(QStringLiteral("logging/wraplines")).toBool());
   m_log_text->setLineWrapMode(m_log_wrap->isChecked() ? QPlainTextEdit::WidgetWidth :
                                                         QPlainTextEdit::NoWrap);
+  m_log_text->setHorizontalScrollBarPolicy(m_log_wrap->isChecked() ? Qt::ScrollBarAsNeeded :
+                                                                     Qt::ScrollBarAlwaysOn);
 
   // Log - Font Selection
   // Currently "Debugger Font" is not supported as there is no Qt Debugger, defaulting to Monospace
@@ -202,6 +204,8 @@ void LogWidget::SaveSettings()
   settings.setValue(QStringLiteral("logging/wraplines"), m_log_wrap->isChecked());
   m_log_text->setLineWrapMode(m_log_wrap->isChecked() ? QPlainTextEdit::WidgetWidth :
                                                         QPlainTextEdit::NoWrap);
+  m_log_text->setHorizontalScrollBarPolicy(m_log_wrap->isChecked() ? Qt::ScrollBarAsNeeded :
+                                                                     Qt::ScrollBarAlwaysOn);
 
   // Log - Font Selection
   settings.setValue(QStringLiteral("logging/font"), m_log_font->currentIndex());