YouTubeVideoUrl: remove InnerTube client API keys

As official clients do not use them anymore.
Add prettyPrint parameter in url for minified JSON response.

src/OAuth.py

@@ -25,9 +25,6 @@ def get_key(x):
 API_KEY = get_key('Xhi3_LoIzw_OizD15SyCNReMvKL27nw_OizDWRR395T5uGWpvn451I2VYc78Gy463')
 CLIENT_ID = get_key('4113447027255-v15bgs05u1o3m278mpjs2vcd0394w_OizDfrg5160drbw_Oiz63D.w_OizDpp75s.googleus87ercontent.99com')
 CLIENT_SECRET = get_key('Zf93pqd2rxgY2ro159rK20BMxif27')
-YT_IOSKEY = get_key('Xhi3_LoIzw_OizD15SyB-63vPrd27ThhKuerbB239N_l7Kwwcxj516yUXhi_Loc63')
-YT_EMBKEY = get_key('Xhi3_LoIzw_OizD15SyXhi_LoO_27FJ2SlqU8Q439STEHLGCilw51_Y9_11qcW863')
-YT_KEY = get_key('Xhi3_LoIzw_OizD15SyXhi_Lo8e27iZmM1Fw_Oi39zDDVjRy-df512KTyQ_vz_y63YM39w')
 
 if path.exists('/etc/enigma2/YouTube.key'):  # pragma: no cover
 	try:

src/YouTubeVideoUrl.py

@@ -19,9 +19,6 @@
 from .compat import compat_URLError
 from .compat import SUBURI
 from .jsinterp import JSInterpreter
-from .OAuth import YT_IOSKEY
-from .OAuth import YT_EMBKEY
-from .OAuth import YT_KEY
 
 
 PRIORITY_VIDEO_FORMAT = ()
@@ -281,12 +278,7 @@ def _extract_dash_audio_format(self, streaming_formats, player_id):
 
 	def _extract_player_response(self, video_id, client):
 		player_id = None
-		KEY = {
-			5: YT_IOSKEY,
-			30: YT_KEY,
-			85: YT_EMBKEY
-		}
-		url = 'https://www.youtube.com/youtubei/v1/player?key=%s' % KEY[client]
+		url = 'https://www.youtube.com/youtubei/v1/player?prettyPrint\u003dfalse'
 		data = {
 			'videoId': video_id,
 			'playbackContext': {