fix(tooltip): keep learner lines out of main NPC tooltip when using secondary

Two parallel learner-tooltip systems both rendered on unit hover, so with
the 'Use secondary learner tooltip' option on, learner spawn/kill lines
still leaked into the main NPC tooltip instead of going solely to the
secondary frame.

QuestieLearner's OnTooltipSetUnit hook (toggle-aware, secondary-capable)
already owns unit-hover learner display, routing it to the main tooltip
(secondary off) or the separate secondary frame (secondary on). But
Tooltip.lua's _GetLearnerTooltipLines also injected learner lines into the
m_<npcId> tooltip data, redundantly.

Add a suppressLearnerLines flag to QuestieTooltips:GetTooltip and pass it
from the NPC unit-hover call in TooltipHandler so the inline lines are
omitted there. Map-pin and object tooltips (no secondary frame) keep their
learner lines. Also removes the latent duplicate present even with the
secondary frame disabled.

Modules/Tooltips/TooltipHandler.lua

@@ -310,7 +310,10 @@ function _QuestieTooltips:AddUnitDataToTooltip()
         ) then
         QuestieTooltips.lastGametooltipUnit = name
 
-        local tooltipData = QuestieTooltips:GetTooltip("m_" .. npcId);
+        -- Suppress System A's inline learner lines here: QuestieLearner's OnTooltipSetUnit
+        -- hook already renders learner spawn/kill data for the hovered unit (into the main
+        -- tooltip, or the separate secondary learner frame when that option is enabled).
+        local tooltipData = QuestieTooltips:GetTooltip("m_" .. npcId, true);
 
         if tooltipData then
             if Questie.db.profile.enableTooltipsNPCID == true then