Bug 1093598 - Move undo addon unistall test from testEnableDisableUndoUninstall.js to testAddons_uninstallExtension. r=amatei, r=mvelimiroviciu

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rename : firefox/tests/functional/testAddons/testEnableDisableUndoUninstall.js => firefox/tests/functional/testAddons/testEnableDisableExtension.js
rename : firefox/tests/functional/restartTests/testAddons_uninstallExtension/test1.js => firefox/tests/functional/testAddons/testUninstallExtension.js