Display Locallab Hue, Chroma and Luma reference values on mask curves

Bugfixe: Locallab reference values were only shown for the last control spot instead of selected one

rtengine/improccoordinator.cc

@@ -922,6 +922,8 @@ void ImProcCoordinator::updatePreviewImage(int todo, bool panningRelatedChange)
                 CurveFactory::complexCurvelocal(ecomp, black / 65535., hlcompr, hlcomprthresh, shcompr, br, cont, lumar,
                                                 hltonecurveloc, shtonecurveloc, tonecurveloc, lightCurveloc, avg,
                                                 sca);
+
+                // Locallab mask curve references are only shown for selected spot
                 if (sp == params->locallab.selspot) {
                     if (locallListener) {
                         locallListener->refChanged(huer, lumar, chromar);