HLE: Applets: Software keyboard: update cursor position on SetInputText (#25)

fixes cursor being at 0 position even when text is present, especially annoying for handheld devices with kde virtual keyboard, which is pretty bad, with no way to move the cursor or delete text backward

Reviewed-on: https://git.ryujinx.app/projects/Ryubing/pulls/25

src/Ryujinx.HLE/HOS/Applets/SoftwareKeyboard/SoftwareKeyboardApplet.cs

@@ -443,6 +443,7 @@ namespace Ryujinx.HLE.HOS.Applets
                     if ((newCalc.Flags & KeyboardCalcFlags.SetInputText) != 0)
                     {
                         _textValue = newCalc.InputText;
+                        _cursorBegin = _textValue.Length;
                         updateText = true;
 
                         Logger.Debug?.Print(LogClass.ServiceAm, $"Input text set to {_textValue}");