Remove useless "ifdef KEYBOARD_*" (#20078)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/keebio/convolution/convolution.c

@@ -14,7 +14,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "convolution.h"
+#include "quantum.h"
 
 #ifdef ENCODER_ENABLE
 bool encoder_update_kb(uint8_t index, bool clockwise) {

keyboards/keebio/convolution/convolution.h

@@ -1,22 +0,0 @@
-/* Copyright 2022 Danny Nguyen <danny@keeb.io>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-
-#include "quantum.h"
-
-#ifdef KEYBOARD_keebio_convolution_rev1
-    #include "rev1.h"
-#endif

keyboards/keebio/convolution/rev1/rev1.h

@@ -16,7 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#include "convolution.h"
 #include "quantum.h"
 
 #define LAYOUT_65xt( \