Use a width ratio for the fichinter signature x position

Replace the hardcoded x=111 with round($s['w'] * 0.53) so the signature
image keeps the known-good pre-21 position on A4 (210mm -> 111) while
scaling for wider formats like Letter (215.9mm -> 114), as suggested in
review.

Signed-off-by: Dolicraft <contact@dolicraft.com>

Author: Dolicraft

htdocs/core/ajax/onlineSign.php

@@ -559,7 +559,7 @@
 										if (getDolGlobalString("FICHINTER_SIGNATURE_XFORIMGSTART")) {
 											$param['xforimgstart'] = getDolGlobalString("FICHINTER_SIGNATURE_XFORIMGSTART");
 										} else {
-											$param['xforimgstart'] = 111;
+											$param['xforimgstart'] = (empty($s['w']) ? 110 : round($s['w'] * 0.53));
 										}
 										if (getDolGlobalString("FICHINTER_SIGNATURE_YFORIMGSTART")) {
 											$param['yforimgstart'] = getDolGlobalString("FICHINTER_SIGNATURE_YFORIMGSTART");
@@ -585,7 +585,7 @@
 								// A signature image file is 720 x 180 (ratio 1/4) but we use only the size into PDF
 								// TODO Get position of box from PDF template
 
-								$param['xforimgstart'] = 111;
+								$param['xforimgstart'] = (empty($s['w']) ? 110 : round($s['w'] * 0.53));
 								$param['yforimgstart'] = (empty($s['h']) ? 250 : $s['h'] - 60);
 								$param['wforimg'] = $s['w'] - ($param['xforimgstart'] + 16);
 
@@ -918,7 +918,7 @@
 										// A signature image file is 720 x 180 (ratio 1/4) but we use only the size into PDF
 										// TODO Get position of box from PDF template
 
-										$param['xforimgstart'] = 111;
+										$param['xforimgstart'] = (empty($s['w']) ? 110 : round($s['w'] * 0.53));
 										$param['yforimgstart'] = (empty($s['h']) ? 250 : $s['h'] - 60);
 										$param['wforimg'] = $s['w'] - ($param['xforimgstart'] + 16);
 
@@ -935,7 +935,7 @@
 								// A signature image file is 720 x 180 (ratio 1/4) but we use only the size into PDF
 								// TODO Get position of box from PDF template
 
-								$param['xforimgstart'] = 111;
+								$param['xforimgstart'] = (empty($s['w']) ? 110 : round($s['w'] * 0.53));
 								$param['yforimgstart'] = (empty($s['h']) ? 250 : $s['h'] - 60);
 								$param['wforimg'] = $s['w'] - ($param['xforimgstart'] + 16);