Eeschema: fix incorrect value of m_Flags member (must be 0) of schematic...

Eeschema: fix incorrect value of m_Flags member (must be 0) of schematic components after loading a schematic file.
Previously,  m_Flags was set to IS_CHANGED, which is incorrect.

eeschema/sch_component.cpp

@@ -1413,6 +1413,10 @@ bool SCH_COMPONENT::Load( LINE_READER& aLine, wxString& aErrorMsg )
         }
     }
 
+    // ensure flags (mainly used in edit) are cleared.
+    // some changes have set the modified flag
+    m_Flags = 0;
+
     return true;
 }