OpenXML Filter: implicitly restrict the styles optimisation for run containers

This is an opposite issue for issue ~~#952~~ to fix the failing integration tests fast:

Failed tests: 
289 net.sf.okapi.roundtrip.integration.RoundTripOpenXmlIT.openXmlFiles(net.sf.okapi.roundtrip.integration.RoundTripOpenXmlIT)
290   Run 1: RoundTripOpenXmlIT.openXmlFiles:48->runTest:86 Compare Lines: DiamondClarity_4Cs Education Source.docx
291   Run 2: RoundTripOpenXmlIT.openXmlFiles:49->runTest:86 Compare Lines: DiamondClarity_4Cs Education Source.docx
292   Run 3: RoundTripOpenXmlIT.openXmlFiles:48->runTest:86 Compare Lines: EndGroup.docx
293   Run 4: RoundTripOpenXmlIT.openXmlFiles:49->runTest:86 Compare Lines: EndGroup.docx
294   Run 5: RoundTripOpenXmlIT.openXmlFiles:48->runTest:86 Compare Lines: TestDako2.docx
295   Run 6: RoundTripOpenXmlIT.openXmlFiles:49->runTest:86 Compare Lines: TestDako2.docx
296   Run 7: RoundTripOpenXmlIT.openXmlFiles:61->runTest:86 Compare Lines: DiamondClarity_4Cs Education Source.docx
297   Run 8: RoundTripOpenXmlIT.openXmlFiles:62->runTest:86 Compare Lines: DiamondClarity_4Cs Education Source.docx
298   Run 9: RoundTripOpenXmlIT.openXmlFiles:61->runTest:86 Compare Lines: EndGroup.docx
299   Run 10: RoundTripOpenXmlIT.openXmlFiles:62->runTest:86 Compare Lines: EndGroup.docx
300   Run 11: RoundTripOpenXmlIT.openXmlFiles:61->runTest:86 Compare Lines: TestDako2.docx
301   Run 12: RoundTripOpenXmlIT.openXmlFiles:62->runTest:86 Compare Lines: TestDako2.docx
302   IcmlXliffCompareIT.icmlXliffCompareFiles:53->runTest:88 Compare Events: TakeItNoItsYoursReallyTheExcellentInevitabilityOfFree.icml
303 Tests run: 124, Failures: 2, Errors: 0, Skipped: 0

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