Sketcher: Fix uninitialized scalar field in ctor

Fixes Coverity issue:
CID 316539 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
uninit_member: Non-static class member lastHasPartialRedundancies is not initialized in this constructor nor in any functions that it calls.

src/Mod/Sketcher/App/SketchObject.cpp

@@ -134,6 +134,7 @@ SketchObject::SketchObject()
     lastDoF=0;
     lastHasConflict=false;
     lastHasRedundancies=false;
+    lastHasPartialRedundancies=false;
     lastHasMalformedConstraints=false;
     lastSolverStatus=0;
     lastSolveTime=0;