Fix PTC control card not available when enabled

[inewcombe27]

Fixes #420

Fixed htmljs/src/js/script-control.js typo that referenced 'ptcs' instead of 'ptc' array to determine whether to show the PTC card on the control page

Other updates to fix issues encountered during build:

• no backup.js file in project anymore, removed references
• issue with 'log_calibrate_ispindel' reference in htmljs/src/logging.tmpl.html
• updates to htmljs/output.sh to make sed perform necessary replacements to cheader files