AbstractProcessStep: Get rid of done hook

Not needed anymore.
Remove emitting 100% progress on finish of CMakeInstallStep,
as that's done automatically by the task tree.

Task-number: QTCREATORBUG-29168
Change-Id: If93d989eeb0a551f00754c5d6ef7f180fdbabdd5
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakeinstallstep.cpp

@@ -38,7 +38,6 @@ public:
         cmakeArguments.setDisplayStyle(StringAspect::LineEditDisplay);
 
         setCommandLineProvider([this] { return cmakeCommand(); });
-        setDoneHook([this](bool) { emit progress(100, {}); });
     }
 
 private: