Fix debug level disconnected on Rx hier block

The debug level was disconnected from the BBdeheader, BCH decoder, and
LDPC decoder blocks. Instead, the debug level was hard-coded to 0 on
them. This patch fixes the issue by connecting the debug level parameter
to the referred blocks.

examples/dvbs2rx_rx_hier.grc

@@ -163,7 +163,7 @@ blocks:
     affinity: ''
     alias: ''
     comment: ''
-    debug_level: '0'
+    debug_level: debug
     framesize: frame_size
     maxoutbuf: '0'
     minoutbuf: '0'
@@ -200,7 +200,7 @@ blocks:
     affinity: ''
     alias: ''
     comment: ''
-    debug_level: '0'
+    debug_level: debug
     framesize: frame_size
     maxoutbuf: '0'
     minoutbuf: '0'
@@ -221,7 +221,7 @@ blocks:
     alias: ''
     comment: ''
     constellation: constellation
-    debug_level: '0'
+    debug_level: debug
     framesize: frame_size
     infomode: INFO_OFF
     max_trials: '25'
@@ -635,4 +635,4 @@ connections:
 
 metadata:
   file_format: 1
-  grc_version: 3.10.5.1
+  grc_version: 3.10.7.0