remove hardcoded SHAPING_FREQ_X from SHAPING_MENU

[ellensp]

Description

It was noticed in #27475 (comment)
That enabling SHAPING_MENU without INPUT_SHAPING_X (but with another axes enabled) causes a compile error

Marlin/src/lcd/menu/menu_advanced.cpp:571:92: error: 'SHAPING_FREQ_X' was not declared in this scope; did you mean 'SHAPING_FREQ_Y'?
  571 |           ACTION_ITEM_N(AXIS, MSG_SHAPING_ENABLE, []{ stepper.set_shaping_frequency(AXIS, (SHAPING_FREQ_X) ?: (SHAPING_MIN_FREQ)); ui.refresh(); });

This is due to the hardcoded use of SHAPING_FREQ_X in the macro SHAPING_MENU_FOR_AXIS

This macro is used to generate the shaping menu items for X,Y and Z
When shaping for the axis is enabled the menu shows the settings for SHAPING_FREQ and SHAPING_ZETA
You can also disable each axis.

This issue is when you enable a disabled axis it needs a default SHAPING_FREQ, it is currently hardcoded to use SHAPING_FREQ_X

This breaks if you don't have INPUT_SHAPING_X enabled.

I updated the Macro SHAPING_MENU_FOR_AXIS to use the correct SHAPING_FREQ_{X|Y|Z} for each axis, so SHAPING_FREQ_X is only used if you have INPUT_SHAPING_X

Requirements

SHAPING_MENU
with any combination of
INPUT_SHAPING_X
INPUT_SHAPING_Y
INPUT_SHAPING_Z

Benefits

Builds as expected

Configurations

Configuration that triggers the issue.zip

Related Issues

Marlin/issues/27475#issuecomment-2439653573