(installer) fix syntax error in invoke.sh.in

[ebr]

extra spaces cause syntax errors; found by https://discord.com/channels/1020123559063990373/1048313657177677824/1048319303390343178

Fixes #1717

[blessedcoolant]

@lstein

[lstein]

Thanks! Interestingly extra whitespace does not interfere with bash on Linux. Maybe a MacOS thing? Because the installer pulls from current repo, I thankfully do not have to issue a new patch release for this one.

[keturn]

Wasn't whitespace:

tail -n21 invoke.sh.in | head -n4 |hexyl
 00000000  ef bf bc 69 66 20 5b 20   22 24 28 75 6e 61 6d 65  ×××if [  "$(uname 
 00000010  20 2d 73 29 22 20 3d 3d   20 22 44 61 72 77 69 6e   -s)" ==  "Darwin 
 00000020  22 20 5d 3b 20 74 68 65   6e 0a ef bf bc 20 20 20  " ]; the n_×××    
 00000030  20 65 78 70 6f 72 74 20   50 59 54 4f 52 43 48 5f   export  PYTORCH_ 
 00000040  45 4e 41 42 4c 45 5f 4d   50 53 5f 46 41 4c 4c 42  ENABLE_M PS_FALLB 
 00000050  41 43 4b 3d 31 0a ef bf   bc 66 69 0a ef bf bc 0a  ACK=1_×× ×fi_×××_ 

idk how \xEF\xBF\xBC managed to get in at the beginning of each of those lines.