Recognize .exp (Expect) files as Tcl

Expect [1] scripts filenames generally end in .exp, although the code
itself is actually in Tcl.  I find my self manually selecting Tcl quite
often, so I think it would be nice if Geany would recognize it direcly
as Tcl.

[1] http://expect.sourceforge.net/

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>

data/filetype_extensions.conf

@@ -61,7 +61,7 @@ Ruby=*.rb;*.rhtml;*.ruby;*.gemspec;Gemfile;rakefile;Rakefile;
 Scala=*.scala;*.scl;
 Sh=*.sh;configure;configure.in;configure.in.in;configure.ac;*.ksh;*.mksh;*.zsh;*.ash;*.bash;.bashrc;bash.bashrc;.bash_*;bash_*;*.m4;PKGBUILD;*profile;
 SQL=*.sql;
-Tcl=*.tcl;*.tk;*.wish;
+Tcl=*.tcl;*.tk;*.wish;*.exp;
 Txt2tags=*.t2t;
 Vala=*.vala;*.vapi;
 Verilog=*.v;