Remove strace call in test that was committed by mistake

Closes #4621

test/regression/4605-fifo-hang/rc

@@ -1,5 +1,5 @@
 exec 5000oabcdefghi<esc>%yppppp
 nop %sh{
     echo "write $kak_response_fifo" > "$kak_command_fifo"
-    strace -o /tmp/strace.log cat "$kak_response_fifo"
+    cat "$kak_response_fifo"
 }