Mark Fixedlen Tagger block as deprecated

This block was deprecated with the introduction of Fixedlen to PDU.
See #425.

(cherry picked from commit 9500c16)

Author: daniestevez

grc/satellites_fixedlen_tagger.block.yml

@@ -1,8 +1,8 @@
 # auto-generated by grc.converter
 
 id: satellites_fixedlen_tagger
-label: Fixed Length Packet Tagger
-category: '[Satellites]/Packet'
+label: Fixed Length Packet Tagger (Deprecated)
+category: '[Satellites]/Deprecated'
 
 parameters:
 -   id: stream_type