tuna: Fix matching irqs in ps_show_thread

To new format to match irqs is "irqs/"
We already test this when we call is_irq_thread(cmd):

With this fix if you do

tuna show_threads

You will get nic information that was previously missed such as

  986     FIFO    50        9     69286            2 irq/164-iwlwifi:default_que
ue iwlwifi:default_queue

Signed-off-by: John Kacur <jkacur@redhat.com>
diff --git a/tuna-cmd.py b/tuna-cmd.py
index b13b25b..80e2752 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -351,17 +351,12 @@
         try:
             if not irqs:
                 irqs = procfs.interrupts()
-            if cmd[:4] == "IRQ-":
-                users = irqs[tuna.irq_thread_number(cmd)]["users"]
-                for u in users:
-                    if u in get_nics():
-                        users[users.index(u)] = "%s(%s)" % (
-                            u, ethtool.get_module(u))
-                users = ",".join(users)
-            else:
-                u = cmd[cmd.find('-') + 1:]
+            users = irqs[tuna.irq_thread_number(cmd)]["users"]
+            for u in users:
                 if u in get_nics():
-                    users = ethtool.get_module(u)
+                    users[users.index(u)] = "%s(%s)" % (
+                        u, ethtool.get_module(u))
+            users = ",".join(users)
         except:
             users = "Not found in /proc/interrupts!"