Remove trailing whitespace in lua files

Whitespace is not significant, so this should not be a problem.
https://secwiki.org/w/Nmap/Code_Standards

scripts/http-vhosts.nse

@@ -22,7 +22,7 @@ various names of the form <name>.example.com are tried.
 ]]
 
 ---
--- @usage 
+-- @usage
 -- nmap --script http-vhosts -p 80,8080,443 <target>
 --
 -- @arg http-vhosts.domain The domain that hostnames will be prepended to, for
@@ -43,12 +43,12 @@ various names of the form <name>.example.com are tried.
 --
 -- @todo feature: move hostnames to an external file and allow the user to use another one
 -- @internal: see http://seclists.org/nmap-dev/2010/q4/401 and http://seclists.org/nmap-dev/2010/q4/445
--- 
--- 
+--
+--
 -- @todo feature: add option report and implement it
--- @internal after stripping sensitive info like ip, domain names, hostnames 
---           and redirection targets from the result, append it to a file 
---           that can then be uploaded. If enough info is gathered, the names 
+-- @internal after stripping sensitive info like ip, domain names, hostnames
+--           and redirection targets from the result, append it to a file
+--           that can then be uploaded. If enough info is gathered, the names
 --           will be weighted. It can be shared with metasploit
 --
 -- @todo feature: fill nsedoc
@@ -81,7 +81,7 @@ end
 
 ---
 -- Makes a target name with a name and a domain
--- @param name string 
+-- @param name string
 -- @param domain string
 -- @return string
 local makeTargetName = function(name,domain)
@@ -102,12 +102,12 @@ end
 -- key -> table
 -- @param result table
 -- @return string
-local collapse = function(result) 
+local collapse = function(result)
   local collapsed = {""}
   for code, group in next, result do
     if  #group > arg_collapse then
       table.insert(collapsed, ("%d names had status %s"):format(#group, code))
-    else 
+    else
       for _,name in ipairs(group) do
         table.insert(collapsed, name)
       end
@@ -130,7 +130,7 @@ local testThread = function(result, host, port, name)
       result[status] = result[status] or {}
       if ( 300 <= http_response.status and http_response.status < 400 ) then
         table.insert(result[status], ("%s : %s -> %s"):format(targetname, status, (http_response.header.location or "(no Location provided)")))
-      else 
+      else
         table.insert(result[status], ("%s : %s"):format(targetname, status))
       end
     end