keyboard-via-joystick button should also be B not A (consistent with others)

libretro/hatari-mapper.c

@@ -515,7 +515,7 @@ void update_input(void)
 
       virtual_kdb(bmp,vkx,vky);
 
-      i=RETRO_DEVICE_ID_JOYPAD_A;
+      i=RETRO_DEVICE_ID_JOYPAD_B;
       if(input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, i)  && vkflag[4]==0)
          vkflag[4]=1;
       else if( !input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, i)  && vkflag[4]==1)
@@ -528,7 +528,6 @@ void update_input(void)
             NPAGE=-NPAGE;oldi=-1;
             //Clear interface zone
             Screen_SetFullUpdate();
-
          }
          else if(i==-1)
             oldi=-1;
@@ -759,7 +758,6 @@ void input_gui(void)
       mouse_r=input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A);
 
       PAS=SAVPAS;
-	
    }
    else
    {
@@ -799,6 +797,5 @@ void input_gui(void)
       gmy=0;
    if (gmy>retroh-1)
       gmy=retroh-1;
-
 }