[Test] Fix rspamc invocation to support arguments passing

test/functional/lib/rspamd.robot

@@ -115,8 +115,8 @@ Run Rspamd
   [Return]  ${TMPDIR}  ${rspamd_pid}  ${rspamd_logpos}
 
 Scan Message With Rspamc
-  [Arguments]  ${msg_file}
-  ${result} =  Run Rspamc  -p  -h  ${LOCAL_ADDR}:${PORT_NORMAL}  ${msg_file}
+  [Arguments]  ${msg_file}  @{vargs}
+  ${result} =  Run Rspamc  -p  -h  ${LOCAL_ADDR}:${PORT_NORMAL}  @{vargs}  ${msg_file}
   [Return]  ${result}
 
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