[PATCH] header.pl: Add reference to colors.txt into header.pl

[Adolf Belka <adolf.belka@ipfire.org>]

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- With change of common css entries into header.pl with commit
   https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=b52a84ddc77f9db7e4ad7b129f21fbf528c6f990
   I had missed that color20 and color22 etc, that come from colors.txt, are not known in
   header.pl so that the alternate colours in tables were missing. Even though I tested the
   previous commit I obviously did not look well enough because I missed that the tables
   had no alternate colours. I just found it now when looking at Core Update 174 Testing.
- Confirmed by copying this version of header.pl into my CU174 Testing system and the
   alternate colour rows came back again as they should be. I am sure now that they are
   correct.

Tested-by: Adolf Belka <adolf.belka(a)ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka(a)ipfire.org>
---
 config/cfgroot/header.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config/cfgroot/header.pl b/config/cfgroot/header.pl
index 955ed2646..3f80ce9b4 100644
--- a/config/cfgroot/header.pl
+++ b/config/cfgroot/header.pl
@@ -17,6 +17,9 @@ use HTML::Entities();
 use Socket;
 use Time::Local;
 
+our %color = ();
+&General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
+
 $|=1; # line buffering
 
 $Header::revision = 'final';
-- 
2.39.2