remove extra echo: from M218_report

[ellensp]

Description

At present M218_report (as seen in M503) displays the following with an extra "echo:", breaking some user interfaces. (eg esp3d web interface)

echo:; Hotend offsets:
echo:echo:  M218 T1 X0.00 Y0.00 Z0.000

After this patch

echo:; Hotend offsets:
echo:  M218 T1 X0.00 Y0.00 Z0.000

also tested with 3 extruders

After this patch with 3 extruders

echo:; Hotend offsets:
echo:  M218 T1 X0.00 Y0.00 Z0.000
echo:  M218 T2 X0.00 Y0.00 Z0.000

Requirements

HOTENDS > 1

Benefits

Output is correctly formatted

Related Issues

[BUG] (The command M218 is not displayed correctly in the web interface in the printer settings - it cannot be edited. MKS Tinybee. bugfix-2.1.x) #27669