jscript: Use proper object as 'this' when function is called on an activation object

[Jacek Caban]

---
 dlls/jscript/engine.c      |   12 ++++++++++++
 dlls/jscript/object.c      |    5 ++++-
 dlls/jscript/tests/lang.js |    6 ++++++
 dlls/jscript/tests/run.c   |    4 ++++
 4 files changed, 26 insertions(+), 1 deletions(-)


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