logrotate: reindent to 4 spaces

4 spaces seems to be the norm on Linux, so reindent from a mix
of 8 spaces and tabs to 4 spaces.

etc/suricata.logrotate.in

@@ -1,13 +1,13 @@
 # Sample /etc/logrotate.d/suricata configuration file.
 @e_logdir@*.log @e_logdir@*.json {
-        daily
+    daily
-        missingok
+    missingok
-        rotate 5
+    rotate 5
-        compress
+    compress
-        delaycompress
+    delaycompress
-        minsize 500k
+    minsize 500k
-	sharedscripts
+    sharedscripts
-	postrotate
+    postrotate
-	    /bin/kill -HUP `cat @e_rundir@suricata.pid 2> /dev/null` 2> /dev/null || true
+        /bin/kill -HUP `cat @e_rundir@suricata.pid 2> /dev/null` 2> /dev/null || true
-	endscript
+    endscript
 }