🩹 Fix redundant var declaration (#23913)

Marlin/src/core/drivers.h

   #define HAS_L64XX_NOT_L6474 1
 #endif
 
-#define AXIS_IS_L64XX(A) (AXIS_DRIVER_TYPE_##A(L6470) || AXIS_DRIVER_TYPE_##A(L6474) ||  AXIS_DRIVER_TYPE_##A(L6480) || AXIS_DRIVER_TYPE_##A(POWERSTEP01))
+#define AXIS_IS_L64XX(A) (AXIS_DRIVER_TYPE_##A(L6470) || AXIS_DRIVER_TYPE_##A(L6474) || AXIS_DRIVER_TYPE_##A(L6480) || AXIS_DRIVER_TYPE_##A(POWERSTEP01))

Marlin/src/gcode/feature/trinamic/M906.cpp

 
   #if AXIS_IS_TMC(X2) || AXIS_IS_TMC(Y2) || AXIS_IS_TMC(Z2) || AXIS_IS_TMC(Z3) || AXIS_IS_TMC(Z4)
     const int8_t index = parser.byteval('I', -1);
-  #else
+  #elif AXIS_IS_TMC(X) || AXIS_IS_TMC(Y) || AXIS_IS_TMC(Z)
     constexpr int8_t index = -1;
   #endif
 

Marlin/src/gcode/feature/trinamic/M911-M914.cpp

     bool report = true;
     #if AXIS_IS_TMC(X2) || AXIS_IS_TMC(Y2) || AXIS_IS_TMC(Z2) || AXIS_IS_TMC(Z3) || AXIS_IS_TMC(Z4)
       const int8_t index = parser.byteval('I', -1);
-    #else
+    #elif AXIS_IS_TMC(X) || AXIS_IS_TMC(Y) || AXIS_IS_TMC(Z)
       constexpr int8_t index = -1;
     #endif
     LOOP_LOGICAL_AXES(i) if (int32_t value = parser.longval(axis_codes[i])) {

Marlin/src/gcode/feature/trinamic/M919.cpp

 
   #if AXIS_IS_TMC(X2) || AXIS_IS_TMC(Y2) || AXIS_IS_TMC(Z2) || AXIS_IS_TMC(Z3) || AXIS_IS_TMC(Z4)
     const int8_t index = parser.byteval('I');
-  #else
+  #elif AXIS_IS_TMC(X) || AXIS_IS_TMC(Y) || AXIS_IS_TMC(Z)
     constexpr int8_t index = -1;
   #endif
 

Marlin/src/lcd/language/language_de.h

   LSTR MSG_ADVANCE_K                      = _UxGT("Vorschubfaktor");
   LSTR MSG_ADVANCE_K_E                    = _UxGT("Vorschubfaktor *");
   LSTR MSG_CONTRAST                       = _UxGT("LCD-Kontrast");
-  LSTR MSG_BRIGHTNESS                     = _UxGT("LCD Helligkeit");
+  LSTR MSG_BRIGHTNESS                     = _UxGT("LCD-Helligkeit");
   LSTR MSG_LCD_BKL_TIMEOUT                = _UxGT("LCD-Ruhezustand (s)");
   LSTR MSG_BRIGHTNESS_OFF                 = _UxGT("LCD ausschalten");
   LSTR MSG_STORE_EEPROM                   = _UxGT("Konfig. speichern");
   LSTR MSG_SETTINGS_STORED                = _UxGT("Einstell. gespei.");
   LSTR MSG_MEDIA_UPDATE                   = _UxGT("FW Update vom Medium");
   LSTR MSG_RESET_PRINTER                  = _UxGT("Drucker neustarten");
-  LSTR MSG_REFRESH                        = LCD_STR_REFRESH  _UxGT("Aktualisieren");
+  LSTR MSG_REFRESH                        = LCD_STR_REFRESH _UxGT("Aktualisieren");
   LSTR MSG_INFO_SCREEN                    = _UxGT("Info");
   LSTR MSG_PREPARE                        = _UxGT("Vorbereitung");
   LSTR MSG_TUNE                           = _UxGT("Justierung");