improved dummy macros handling of spaces in parameters strings values

[Frix-x]

Improve dummy macros parameter handling by removing empty-string fallbacks and applying xmlattr filtering to properly quote and escape values with spaces.

Enhancements:

• Remove empty-string fallback logic for None macro parameters across dummy macros
• Apply xmlattr filter to macro parameter outputs for proper quoting and escaping of values containing spaces

[sourcery-ai[bot]]

Reviewer's Guide

This PR simplifies the dummy macro parameter mappings by removing explicit empty‐string fallbacks and applies the Jinja xmlattr filter to properly quote values containing spaces in the rendered G-code commands.

File-Level Changes

Change	Details	Files
Removed redundant conditional defaults in parameter dictionaries	Eliminated "if ... is not none else ''" wrappers for all optional params Simplified assignments for ACCEL_PER_HZ, Z_HEIGHT, ACCEL_CHIP, FREQ_START, FREQ_END, MAX_SCALE, SCV, MAX_SMOOTHING Unified behavior so undefined or None params simply remain None Reduced boilerplate across all dummy macros	shaketune/dummy_macros.cfg
Applied xmlattr filter in Jinja loops for safe value quoting	Replaced {key}={value} with `{key}={{ value	xmlattr }}` in macro expansions Ensured parameters with spaces are escaped and quoted properly Updated loops in _EXCITATE_AXIS_AT_FREQ, _COMPARE_BELTS_RESPONSES, _AXES_SHAPER_CALIBRATION

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