Adjustable precision in M105 temperature report (#20602)

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

Marlin/src/module/temperature.cpp

       if (e >= 0) SERIAL_CHAR('0' + e);
     #endif
     SERIAL_CHAR(':');
-    SERIAL_ECHO(c);
-    SERIAL_ECHOPAIR(" /" , t);
+    SERIAL_PRINT(c, _MIN(SERIAL_FLOAT_PRECISION, 2));
+    SERIAL_ECHOPGM(" /");
+    SERIAL_PRINT(t, _MIN(SERIAL_FLOAT_PRECISION, 2));
     #if ENABLED(SHOW_TEMP_ADC_VALUES)
       SERIAL_ECHOPAIR(" (", r * RECIPROCAL(OVERSAMPLENR));
       SERIAL_CHAR(')');