Error if settings file doesn't exist

[jperedadnr]

Hotfix added this line: https://github.com/openjfx/javafx-maven-plugin/blob/master/src/main/java/org/openjfx/JavaFXRunFixMojo.java#L139 which takes the user settings file into account. But if it doesn't exist, there is a runtime error. See https://stackoverflow.com/questions/69336290/eclipse-maven-javafx-maven-home-not-specified

[SingingBush]

I've just hit this bug. A settings.xml file is optional so the plugin should not assume it exists. Rolling back to 0.0.6 sorted it.