message: [GUI] dashboard change theme, staking graph fix.
diff: @@ -45,7 +45,6 @@ DashboardWidget::DashboardWidget(PIVXGUI* parent) :
  // Title
  ui->labelTitle->setProperty("cssClass", "text-title-screen");
  -
  ui->labelTitle2->setText(tr("Staking Rewards"));
  ui->labelTitle2->setProperty("cssClass", "text-title-screen");
  @@ -72,9 +71,7 @@ DashboardWidget::DashboardWidget(PIVXGUI* parent) :
  ui->labelAmountPiv->setProperty("cssClass", "text-stake-piv-disable");
  ui->labelAmountZpiv->setProperty("cssClass", "text-stake-zpiv-disable");
  - ui->pushButtonAll->setProperty("cssClass", "btn-check-time");
  - ui->pushButtonMonth->setProperty("cssClass", "btn-check-time");
  - ui->pushButtonYear->setProperty("cssClass", "btn-check-time");
  + setCssProperty({ui->pushButtonAll, ui->pushButtonMonth, ui->pushButtonYear}, "btn-check-time");
  ui->comboBoxMonths->setProperty("cssClass", "btn-combo-chart-selected");
  ui->comboBoxYears->setProperty("cssClass", "btn-combo-chart-selected");
  @@ -271,8 +268,7 @@ void DashboardWidget::walletSynced(bool sync){
  void DashboardWidget::changeTheme(bool isLightTheme, QString& theme){
  static_cast<TxViewHolder*>(this->txViewDelegate->getRowFactory())->isLightTheme = isLightTheme;
  - if (hasStakes())
  - this->changeChartColors();
  + if (chart) this->changeChartColors();
  }
  const QStringList monthsNames = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
  