Fix a situation where copy/paste hotkeys don't work.

Author: SuuperW

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.Designer.cs

@@ -942,6 +942,13 @@ private void TAStudio_MouseLeave(object sender, EventArgs e)
 			toolTip1.SetToolTip(TasView, null);
 		}
 
+		private void TAStudio_Activated(object sender, EventArgs e)
+		{
+			// The copy/paste shortcut keys are handled by the right-click context menu, not EmuHawk hotkeys.
+			// So they will only work if TasView is focused.
+			TasView.Select();
+		}
+
 		private void TAStudio_Deactivate(object sender, EventArgs e)
 		{
 			if (_leftButtonHeld)