qt, refactor: Drop redundant history cleaning in RPC console

The default clearHistory=true argument is passed in the RPCConsole ctor
only. This is needless, as the history and historyPtr members are
initialized properly.

src/qt/rpcconsole.cpp

@@ -494,7 +494,7 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
     ui->lineEdit->setMaxLength(16 * 1024 * 1024);
     ui->messagesWidget->installEventFilter(this);
 
-    connect(ui->clearButton, &QPushButton::clicked, [this] { clear(/* clearHistory */ false); });
+    connect(ui->clearButton, &QPushButton::clicked, [this] { clear(); });
     connect(ui->fontBiggerButton, &QPushButton::clicked, this, &RPCConsole::fontBigger);
     connect(ui->fontSmallerButton, &QPushButton::clicked, this, &RPCConsole::fontSmaller);
     connect(ui->btnClearTrafficGraph, &QPushButton::clicked, ui->trafficGraph, &TrafficGraphWidget::clear);
@@ -776,19 +776,14 @@ void RPCConsole::setFontSize(int newSize)
 
     // clear console (reset icon sizes, default stylesheet) and re-add the content
     float oldPosFactor = 1.0 / ui->messagesWidget->verticalScrollBar()->maximum() * ui->messagesWidget->verticalScrollBar()->value();
-    clear(false);
+    clear();
     ui->messagesWidget->setHtml(str);
     ui->messagesWidget->verticalScrollBar()->setValue(oldPosFactor * ui->messagesWidget->verticalScrollBar()->maximum());
 }
 
-void RPCConsole::clear(bool clearHistory)
+void RPCConsole::clear()
 {
     ui->messagesWidget->clear();
-    if(clearHistory)
-    {
-        history.clear();
-        historyPtr = 0;
-    }
     ui->lineEdit->clear();
     ui->lineEdit->setFocus();
 

src/qt/rpcconsole.h

@@ -99,7 +99,7 @@ private Q_SLOTS:
     void updateDetailWidget();
 
 public Q_SLOTS:
-    void clear(bool clearHistory = true);
+    void clear();
     void fontBigger();
     void fontSmaller();
     void setFontSize(int newSize);