Fix various errors, warnings in example config builds (#19686)

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

Marlin/src/gcode/bedlevel/G26.cpp

@@ -511,11 +511,9 @@ void GcodeSuite::G26() {
        g26_keep_heaters_on       = parser.boolval('K');
 
   // Accept 'I' if temperature presets are defined
-  const uint8_t preset_index = (0
-    #if PREHEAT_COUNT
-      + (parser.seenval('I') ? _MIN(parser.value_byte(), PREHEAT_COUNT - 1) + 1 : 0)
-    #endif
-  );
+  #if PREHEAT_COUNT
+    const uint8_t preset_index = parser.seenval('I') ? _MIN(parser.value_byte(), PREHEAT_COUNT - 1) + 1 : 0;
+  #endif
 
   #if HAS_HEATED_BED
 

Marlin/src/gcode/motion/M290.cpp

@@ -127,7 +127,7 @@ void GcodeSuite::M290() {
         #else
           PSTR("Babystep Z")
         #endif
-        , babystep.axis_total[BS_AXIS_IND(Z_AXIS)]
+        , babystep.axis_total[BS_TOTAL_IND(Z_AXIS)]
       );
     }
     #endif