Fix control line edit crash when undoing history

When perspective control line editing is active and the history entry is
changed such that edit mode is automatically disabled, there is a crash.
The history change triggers a processing parameters update and disables
editing. When editing is disabled, the perspective tool also tries to
update the processing parameters, causing a double mutex lock attempt.

This commit avoids updating parameters from the perspective tool and
uses the tweak operator (introduced with the spot removal tool) to achieve
the same effect.

Closes #6251.

rtgui/perspective.h

@@ -24,6 +24,7 @@
 #include "controllines.h"
 #include "lensgeomlistener.h"
 #include "toolpanel.h"
+#include "../rtengine/tweakoperator.h"
 
 class PerspCorrectionPanelListener
 {
@@ -34,6 +35,7 @@ public:
 };
 
 class PerspCorrection final :
+    public rtengine::TweakOperator,
     public ToolParamBlock,
     public AdjusterListener,
     public FoldableToolPanel
@@ -91,6 +93,7 @@ protected:
     const rtengine::FramesMetaData* metadata;
 
     void applyControlLines (void);
+    void tweakParams(rtengine::procparams::ProcParams &pparams) override;
     void setCamBasedEventsActive (bool active = true);
     void setFocalLengthValue (const rtengine::procparams::ProcParams* pparams, const rtengine::FramesMetaData* metadata);