[pal] Respect user set number of line candidates

The number of positions used for generating line label candidates
was hardcoded and was not using the pal number of line candidate
setting.

This change means the number of line candidates can be bumped up
resulting in more candidates actually being generated and
a better final label placement

(cherry-picked from 7797e80)

src/core/pal/feature.cpp

@@ -641,9 +641,8 @@ int FeaturePart::createCandidatesAlongLine( QList< LabelPosition* >& lPos, Point
 
   if ( nbls > 0 )
   {
-    //dist /= nbls;
     l = 0;
-    dist = qMin( yrm, xrm );
+    dist = qMin( qMin( yrm, xrm ), dist / mLF->layer()->pal->line_p );
   }
   else   // line length < label with => centering label position
   {
@@ -1002,7 +1001,7 @@ int FeaturePart::createCurvedCandidatesAlongLine( QList< LabelPosition* >& lPos,
   bool isRightToLeft = ( lineAngle > M_PI / 2 || lineAngle <= -M_PI / 2 );
 
   QLinkedList<LabelPosition*> positions;
-  double delta = qMax( li->label_height, total_distance / 10.0 );
+  double delta = qMax( li->label_height, total_distance / mLF->layer()->pal->line_p );
 
   unsigned long flags = mLF->layer()->arrangementFlags();
   if ( flags == 0 )