CLEANUP: flt-trace: Remove unused random-parsing option

This option was only used by the legacy HTTP mode. In HTX, it is not used. So it
can be removed.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 2a7a9a5..3ae4d5c 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -20266,16 +20266,12 @@
 9.1. Trace
 ----------
 
-filter trace [name <name>] [random-parsing] [random-forwarding] [hexdump]
+filter trace [name <name>] [random-forwarding] [hexdump]
 
   Arguments:
     <name>               is an arbitrary name that will be reported in
                          messages. If no name is provided, "TRACE" is used.
 
-    <random-parsing>     enables the random parsing of data exchanged between
-                         the client and the server. By default, this filter
-                         parses all available data. With this parameter, it
-                         only parses a random amount of the available data.
 
     <random-forwarding>  enables the random forwarding of parsed data. By
                          default, this filter forwards all previously parsed
diff --git a/src/flt_trace.c b/src/flt_trace.c
index 386de41..4b27cd5 100644
--- a/src/flt_trace.c
+++ b/src/flt_trace.c
@@ -32,7 +32,6 @@
 struct trace_config {
 	struct proxy *proxy;
 	char         *name;
-	int           rand_parsing;
 	int           rand_forwarding;
 	int           hexdump;
 };
@@ -188,8 +187,7 @@
 	fconf->flags |= FLT_CFG_FL_HTX;
 	fconf->conf = conf;
 
-	FLT_TRACE(conf, "filter initialized [read random=%s - fwd random=%s - hexdump=%s]",
-	      (conf->rand_parsing ? "true" : "false"),
+	FLT_TRACE(conf, "filter initialized [fwd random=%s - hexdump=%s]",
 	      (conf->rand_forwarding ? "true" : "false"),
 	      (conf->hexdump ? "true" : "false"));
 	return 0;
@@ -633,7 +631,7 @@
 				pos++;
 			}
 			else if (!strcmp(args[pos], "random-parsing"))
-				conf->rand_parsing = 1;
+				continue; // ignore
 			else if (!strcmp(args[pos], "random-forwarding"))
 				conf->rand_forwarding = 1;
 			else if (!strcmp(args[pos], "hexdump"))