Remove space from JMeter functions generated expressions parameters which can make components parsing fail

For instance, rpsThreadGroup limit was not being respected since parsing was failing due to parameter containing a space and the error was only reported in debug logs which were not visible to users by default.

Author: rabelenda-abstracta

jmeter-java-dsl/src/main/java/us/abstracta/jmeter/javadsl/core/util/JmeterFunction.java

@@ -16,7 +16,7 @@ public static String from(String name, Object... args) {
         .map(a -> a instanceof Double || a instanceof Float
             ? String.format(Locale.US, "%f", a)
             : a.toString().replace(",", "\\,"))
-        .collect(Collectors.joining(", ")) + ")"
+        .collect(Collectors.joining(",")) + ")"
         : "";
     return "${" + name + argsString + "}";
   }