[birt-dev] CheckIn: Fix[Bugzilla] 133990：Image type list in new embedded

["Xiong Zhang" <xiong.zhang@xxxxxxxxxxx>]

-Summary:
Image type list in new embedded images
 
- Bugzilla Bug (s) Resolved:133990
 
- Description:
 I've changed the file extension  to show all the image files  

- Tests Description: Manual
 
- Notes to Build Team:
 
- Notes to Developers:
 
- Notes to QA:
 
- Notes to Documentation:
 
- Files Added:
 
- Files Edited:
  \org\eclipse\birt\report\designer\internal\ui\dialogs\BgImageFieldEditor.java
 \org\eclipse\birt\report\designer\internal\ui\views\outline\providers\EmbeddedImagesNodeProvider.java
\org\eclipse\birt\report\designer\ui\actions\PublishTemplateAction.java