SDL: Don't remove entries from an existing scancode keymap

SDL Commits
1 
From 2c1923859ab959f63981726cc60c30535815e4b9 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 13 Oct 2022 22:50:57 -0700
Subject: [PATCH] Don't remove entries from an existing scancode keymap

If we can't find the X11 keysym, it's likely that either the keysym is NoSymbol, in which case we won't hit it anyway, or it's been mapped to a character, in which case the existing mapping is correct for the scancode and the character will be reflected in the keycode mapping.
---
 src/video/x11/SDL_x11keyboard.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11keyboard.c b/src/video/x11/SDL_x11keyboard.c
index 1e46f5a4fb2e..ffa575d550e5 100644
--- a/src/video/x11/SDL_x11keyboard.c
+++ b/src/video/x11/SDL_x11keyboard.c
@@ -655,7 +655,7 @@ X11_InitKeyboard(_THIS)
             if (scancode == data->key_layout[i]) {
                 continue;
             }
-            if (scancode == SDL_SCANCODE_UNKNOWN || default_keymap[scancode] >= SDLK_SCANCODE_MASK) {
+            if (default_keymap[scancode] >= SDLK_SCANCODE_MASK) {
                 /* Not a character key, safe to remap */
 #ifdef DEBUG_KEYBOARD
                 SDL_Log("Changing scancode, was %d (%s), now %d (%s)\n", data->key_layout[i], SDL_GetScancodeName(data->key_layout[i]), scancode, SDL_GetScancodeName(scancode));