Serial refactor. Default 8-bit ECHO to int, not char (#20985)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/feature/bedlevel/bedlevel.cpp

@@ -160,7 +160,7 @@ void reset_bed_level() {
     #ifndef SCAD_MESH_OUTPUT
       LOOP_L_N(x, sx) {
         serial_spaces(precision + (x < 10 ? 3 : 2));
-        SERIAL_ECHO(int(x));
+        SERIAL_ECHO(x);
       }
       SERIAL_EOL();
     #endif
@@ -172,7 +172,7 @@ void reset_bed_level() {
         SERIAL_ECHOPGM(" [");             // open sub-array
       #else
         if (y < 10) SERIAL_CHAR(' ');
-        SERIAL_ECHO(int(y));
+        SERIAL_ECHO(y);
       #endif
       LOOP_L_N(x, sx) {
         SERIAL_CHAR(' ');