Corrected process() argument syntax to dispel PHP warning

[Finetuned]

Editing the TV on a resource generates a PHP warning like:

Declaration of MapsTvInputRender::process(, = Array) should be compatible with modTemplateVarRender::process(, array = Array)

A simple addition of array to the second argument:

public function process($value, $params = array())

to
public function process($value, array $params = array())

Fixes #23

[Serifenlos]

Thanks. This helped me to turn off the error-massage. I will keep an eye to that function.