[CUETools] Fix gray out of setting under Tagging

So far, the CheckBox under Advanced Settings:
Tagging - "Overwrite CUE data" was only grayed out (enabled/disabled)
after clicking OK. The CheckBox should be enabled/disabled immediately
as soon as "Fill up missing CUE data from tags" is checked/unchecked.

- Add statement to frmSettings.Designer.cs, that wires the event to the
  event handler for chkFillUpCUE_CheckedChanged()
- Remark: The event method calling EnableDisable() has already been
  there before in frmSettings.cs:
  private void chkFillUpCUE_CheckedChanged(object sender, EventArgs e)
  {
    EnableDisable();
  }

CUETools/frmSettings.Designer.cs

@@ -824,6 +824,7 @@ namespace JDP
             resources.ApplyResources(this.chkFillUpCUE, "chkFillUpCUE");
             this.chkFillUpCUE.Name = "chkFillUpCUE";
             this.chkFillUpCUE.UseVisualStyleBackColor = true;
+            this.chkFillUpCUE.CheckedChanged += new System.EventHandler(this.chkFillUpCUE_CheckedChanged);
             // 
             // tabPage2
             //