Change default for weatherEndpoint according to API 3.0 (#3583)

since API 3.0 is default, weatherEndpoint should be set to "/onecall"
Fixes #3574

ATTENTION: since lat / lon defaults to 0 / 0, the weather plugins works
after this patch, but shows the weather from
https://de.wikipedia.org/wiki/Null_Island if lat / lon is not manually
set.

---------

Co-authored-by: Karsten Hassel <hassel@gmx.de>
Co-authored-by: Pedro Lamas <pedrolamas@gmail.com>

tests/configs/modules/weather/currentweather_options.js

@@ -5,6 +5,8 @@ let config = {
 			position: "bottom_bar",
 			config: {
 				location: "Munich",
+				weatherProvider: "openweathermap",
+				weatherEndpoint: "/weather",
 				mockData: '"#####WEATHERDATA#####"',
 				windUnits: "beaufort",
 				showWindDirectionAsArrow: true,