Remove useless "ifdef KEYBOARD_*" (#20078)

Co-authored-by: Nick Brassel <[email protected]>

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) {