Ignore OpenOffice directories during installation

[dstillman]

We're still checking "C:\Program Files (x86)\OpenOffice 4" and similar for unopkg.exe, which causes failures:

[JavaScript Error: "uncaught exception: unopkg at C:\Program Files (x86)\OpenOffice 4\program\unopkg.exe failed to install"]
[JavaScript Error: "TypeError: temp is null" {file: "chrome://zotero/content/bindings/preferences-win.xml" line: 1225}]
getPreferenceElement@chrome://zotero/content/bindings/preferences-win.xml:1225:11
userChangedValue@chrome://zotero/content/bindings/preferences-win.xml:1273:25
onxblcommand@chrome://zotero/content/bindings/preferences-win.xml:1312:9

[JavaScript Error: "uncaught exception: unopkg at C:\Program Files (x86)\OpenOffice 4\program\unopkg.exe failed to install"]

[dstillman]

https://forums.zotero.org/discussion/104887/unable-to-install-openoffice-plugin

This still seems to be happening?