Bug 538726 - Eclipse Help Server XSS

Use "UrlUtil.htmlEncode()" instead of "UrlUtil.JavaScriptEncode()" to
encode "data.getTitle()" to avoid that the search tab title is displayed
as "Search\u0020Results" (instead of as "Search Results").

Change-Id: I0daf7203b062fc32f7d2c3dca3c4b7d332637b99
Signed-off-by: Holger Voormann <eclipse@voormann.de>