Refactor UpdateDisplay() to call UpdateUploadRate()

Extracted from: jamulussoftware#2550
Related to: https://github.com/jamulussoftware/jamulus/pull/3364/files/21815c1a0708979fe0414c30e0294feaa7632be3#r1759185427

Co-authored-by: ann0see <[email protected]>

Author: pgScorpio

src/clientsettingsdlg.cpp

@@ -1063,25 +1063,31 @@ void CClientSettingsDlg::OnSndCrdBufferDelayButtonGroupClicked ( QAbstractButton
     UpdateDisplay();
 }
 
+/// @method
+/// @brief Sets upstream rate label to current upload rate if the client is connected, else resets label
 void CClientSettingsDlg::UpdateUploadRate()
 {
-    // update upstream rate information label
-    lblUpstreamValue->setText ( QString().setNum ( pClient->GetUploadRateKbps() ) );
-    lblUpstreamUnit->setText ( "kbps" );
+    // update upstream rate information label if needed
+    if ( pClient->IsConnected() )
+    {
+        lblUpstreamValue->setText ( QString().setNum ( pClient->GetUploadRateKbps() ) );
+        lblUpstreamUnit->setText ( "kbps" );
+    }
+    else
+    {
+        // clear text labels with client parameters
+        lblUpstreamValue->setText ( "---" );
+        lblUpstreamUnit->setText ( "" );
+    }
 }
 
+/// @method
+/// @brief Updates slider controls (settings might have been changed) and upstream rate information label
 void CClientSettingsDlg::UpdateDisplay()
 {
-    // update slider controls (settings might have been changed)
     UpdateJitterBufferFrame();
     UpdateSoundCardFrame();
-
-    if ( !pClient->IsRunning() )
-    {
-        // clear text labels with client parameters
-        lblUpstreamValue->setText ( "---" );
-        lblUpstreamUnit->setText ( "" );
-    }
+    UpdateUploadRate();
 }
 
 void CClientSettingsDlg::UpdateDirectoryComboBox()