Disable ref lookup when References column is hidden

[DominikPalo]

setShowBOMColumn is meant to disable and clear the ref lookup box when the References column is hidden, but it compared the column name against "references" while the column is named "References" (as used everywhere else, e.g. entryMatches and initDefaults). The branch never ran, so:

• hiding References left the ref lookup box enabled, and
• an active lookup kept filtering the BOM by a column that was no longer visible, with nothing on screen explaining why rows were missing.

Changes:

• ibom.js: compare against "References", so hiding the column disables the box, clears it and drops its filter (the existing logic), and showing it re-enables the box.
• util.js (initDefaults): also set the box's disabled state when References is restored as hidden from local storage. Without this the box was enabled again after a reload even though the column was still hidden.

Testing

KiCad Arduino_Uno template, local storage cleared before each run:

Step	master	this PR
Ref lookup J1	1 of 4 rows	1 of 4 rows
Hide References via the column menu	box still enabled, value J1, BOM still filtered to 1 row	box disabled and cleared, all 4 rows shown
Reload with References hidden	box enabled	box disabled
Show References again	(n/a)	box enabled, lookup J2 filters to 1 row

No console errors.

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