[Pas2js] TJSCrypto name minor error

[warleyalex]

code to reproduce the issue:
------
var
  data: TJSUint8Array;

begin
  data := TJSUint8Array.New(16);
  TJSCrypto.getRandomValues(data);
------

We have this msg when compiling:
 Error: Cannot access this member from a class
*******
...to make to work, I have to make 2 changes in the definition:

1st) add the modifier class procedure and
2nd) put the external name "crypto" instead of "Crypto"
to avoid 
   Uncaught TypeError: Crypto.getRandomValues is not a function

  





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