Fix #307982: Palm mute/let ring line continuous instead of dashed bef…

…ore system break

Also ENG-97: Dashed lines that cross systems become continuous

The problem was that MuseScore was attempting to draw the hook with the solid line style even when there was no hook to be drawn (because the line continued to the next system)

Backport of musescore#8903

libmscore/textlinebase.cpp

@@ -146,11 +146,11 @@ void TextLineBaseSegment::draw(QPainter* painter) const
             int end = npoints;
             //draw centered hooks as solid
             painter->setPen(solidPen);
-            if (tl->beginHookType() == HookType::HOOK_90T) {
+            if (tl->beginHookType() == HookType::HOOK_90T && (isSingleType() || isBeginType())) {
                   painter->drawLines(&points[0], 1);
                   start++;
                   }
-            if (tl->endHookType() == HookType::HOOK_90T) {
+            if (tl->endHookType() == HookType::HOOK_90T && (isSingleType() || isEndType())) {
                   painter->drawLines(&points[npoints-1], 1);
                   end--;
                   }