Fix completion of files inside *.tar.bz2 archives when [Ijy] is not given.

CHANGES

@@ -2,7 +2,7 @@ bash-completion (2.x)
 
   [ Ville Skyttä ]
   * Add reptyr completion.
-  * Improve aspell, gendiff, and smartctl completions.
+  * Improve aspell, gendiff, smartctl, and tar completions.
   * Try harder to find the correct perl executable to run the perl helper with.
   * Drop rpm query support for rpm < 4.1.
   * Split rpm and rpmbuild completions and improve them both.

completions/tar

@@ -20,7 +20,7 @@ _tar()
             ;;
         +([^IZzJjy])f)
             ext='@(@(tar|gem|spkg)?(.@(Z|[gx]z|bz?(2)|lzma))|t@([glx]z|bz?(2)))'
-            regex='\(\(tar\|gem\|spkg\)\(\.\(Z\|[gx]z\|bz?(2)\|lzma\)\)\?\|t\([glx]z\|bz2\?\)\)'
+            regex='\(\(tar\|gem\|spkg\)\(\.\(Z\|[gx]z\|bz2\?\|lzma\)\)\?\|t\([glx]z\|bz2\?\)\)'
             ;;
         *[Zz]*f)
             ext='@(t?(ar.)|gem.|spkg.)@(gz|Z)'