rename multicol-height-001 to multicol-height-002 to avoid file name conflict
removed -moz- prefixes

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rename : contributors/mozilla/submitted/mozilla-central-reftests/multicol3/multicol-height-001.xht => contributors/mozilla/submitted/mozilla-central-reftests/multicol3/multicol-height-002.xht
rename : contributors/mozilla/submitted/mozilla-central-reftests/multicol3/reference/multicol-height-001.xht => contributors/mozilla/submitted/mozilla-central-reftests/multicol3/reference/multicol-height-002.xht