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setup: Fix disabling of joystick button bindings.

When setting a joystick button binding to -1 to disable it, set it
directly; do not go through to the physical button mapping layer.

Also add a quick note to encourage users to send in details of their
gamepads.

--- a/src/setup/joystick.c

+++ b/src/setup/joystick.c

@@ -239,6 +239,7 @@

     printf("Unknown joystick '%s' with %i axes, %i buttons, %i hats\n",

            name, axes, buttons, hats);

+    printf("Please consider sending in details about your gamepad!\n");

     return NULL;

 }

@@ -270,7 +271,7 @@

         }

         // For buttons, set the virtual button mapping as well.

-        if (M_StringStartsWith(config->name, "joyb_"))

+        if (M_StringStartsWith(config->name, "joyb_") && config->value >= 0)

         {

             joystick_physical_buttons[button] = config->value;

             M_snprintf(buf, sizeof(buf), "%i", button);