Decompiler fails to unescape {{ in format() function calls

[majastrz]

Bicep version
v0.3.255

Describe the bug
Decompiler fails to unescape {{ in format() function calls

To Reproduce
Assume the following:

Decompilation produces this in Bicep:

Compiling the decompiled Bicep produces the following (2 curlies become 4):

[majastrz]

Ideally the fix should be to unescape the {{ when converting the format() call into a string interpolation expression. However, if that has complications, we can always skip converting into a string interpolation if {{ is detected.