Fix nf-httpfs module name in build file

Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

build.gradle

@@ -247,7 +247,7 @@ task exportClasspath {
         def home = System.getProperty('user.home')
         def all = getRuntimeConfigs()
         def libs = all.collect { File file ->  /*println file.canonicalPath.replace(home, '$HOME');*/ file.canonicalPath;  }
-        ['nextflow','nf-commons','nf-httfs'].each {libs << file("modules/$it/build/libs/${it}-${version}.jar").canonicalPath }
+        ['nextflow','nf-commons','nf-httpfs'].each {libs << file("modules/$it/build/libs/${it}-${version}.jar").canonicalPath }
         file('.launch.classpath').text = libs.unique().join(':')
     }
 }