Fix LG TVs pre 2012 (can't get session id)

[SmoothMC]

Fix for LG TVs pre 2012.
Without it cant get the session id

[splinter98]

I've had a look at this - and as this logic originates from the prior to this fork - I wanted to see if I can verify if this logic was always incorrect. From the other code I've seen that does looks to be the case.

For my understanding, after you made this change can you confirm if you are also able to get a valid response from the [get_volume](https://github.com/Drafteed/python-lgnetcast/blob/e5781eba2c1d246edfc40163c2a435e88e98f8da/pylgnetcast/pylgnetcast.py#L212) function as this change will also affect that function as well and whilst it seems this PR seems to suggest the HDCP support never worked properly (as authentication didn't work) it be good to ensure we ensure all the features work as expected.

Unfortunately I have a 2012 TV, so I cannot verify any pre-2012 functionality myself.

[Drafteed]

Before I switched from wokar/pylgnetcast, HA depended on v0.2.0. HDCP support was added in v0.3.0 (5ad0e36).
HDCP is a very rare case and it seems almost nobody used it. In addition, HA integration does not support the HDCP protocol.

I think we can accept this and in case of problems we will roll back.

[Drafteed]

For my understanding, after you made this change can you confirm if you are also able to get a valid response from the get_volume function as this change will also affect that function as well and whilst it seems this PR seems to suggest the HDCP support never worked properly (as authentication didn't work) it be good to ensure we ensure all the features work as expected.

After confirmation we can merge.

[SmoothMC]

I will have a look.
I recognized another issue with the hdcp protocol. The Key Codes are completely different at hdcp.
i will try to find a way to add this key codes to the script

POWER = 8
NUMBER_0 = 16
NUMBER_1 = 17
NUMBER_2 = 18
NUMBER_3 = 19
NUMBER_4 = 20
NUMBER_5 = 21
NUMBER_6 = 22
NUMBER_7 = 23
NUMBER_8 = 24
NUMBER_9 = 25
MUTE_TOGGLE = 9
HOME_MENU = 67
DASH = 76
FLASHBACK = 26
CHANNEL_LIST = 83
OK = 68
CHANNEL_UP = 0
CHANNEL_DOWN = 1
VOLUME_UP = 2
VOLUME_DOWN = 3
UP = 64
DOWN = 65
LEFT = 7
RIGHT = 6
BACK = 40
EXIT = 91
CONFIRM = 68
QUICK_MENU = 69
RED = 114
GREEN = 113
YELLOW = 99
BLUE = 97
LIVE_TV = 158
STOP = 177
PLAY = 176
PAUSE = 186
SKIP_BACKWARD = 143
SKIP_FORWARD = 142
RECORD = 189
EPG = 169
ENERGY_SAVING = 149
AV_MODE = 48
EXTERNAL_INPUT = 11
FAVORITE_CHANNEL = 30
SIMPLINK = 126
ASPECT_RATIO = 121
PROGRAM_INFORMATION = 170
NETCAST = 89
GUIDE = 169
SHOW_SUBTITLE = 57
TELE_TEXT = 32
TEXT_OPTION = 33
AUDIO_DESCRIPTION = 145