index id param in URI event of ERC1155ownable

[pcaversaccio]

What I did

The ERC-1155 event URI is defined like that:

event URI(string _value, uint256 indexed _id);

Fix the missing index in the example contract ERC1155ownable.

How to verify it

Check here: https://eips.ethereum.org/EIPS/eip-1155.

Commit message

index id param in URI event of ERC1155ownable

Description for the changelog

Index id param in URI event of example contract ERC1155ownable.

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[charles-cooper]

seems fine if tests pass

[codecov-commenter]

Codecov Report

Merging #3203 (6888d95) into master (f992492) will decrease coverage by 21.20%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #3203       +/-   ##
===========================================
- Coverage   88.43%   67.23%   -21.21%     
===========================================
  Files          88       88               
  Lines       11046    11042        -4     
  Branches     2338     2271       -67     
===========================================
- Hits         9769     7424     -2345     
- Misses        822     2961     +2139     
- Partials      455      657      +202     

Impacted Files	Coverage Δ
vyper/builtins/_utils.py	0.00% <0.00%> (-100.00%)	⬇️
vyper/ir/s_expressions.py	5.88% <0.00%> (-88.24%)	⬇️
vyper/ast/natspec.py	12.34% <0.00%> (-86.42%)	⬇️
vyper/cli/utils.py	16.66% <0.00%> (-71.43%)	⬇️
vyper/compiler/utils.py	30.00% <0.00%> (-70.00%)	⬇️
vyper/cli/vyper_json.py	9.40% <0.00%> (-69.69%)	⬇️
vyper/semantics/types/utils.py	30.30% <0.00%> (-65.16%)	⬇️
vyper/compiler/output.py	27.60% <0.00%> (-61.46%)	⬇️
vyper/semantics/analysis/data_positions.py	36.84% <0.00%> (-54.74%)	⬇️
vyper/builtins/_convert.py	39.42% <0.00%> (-51.62%)	⬇️
... and 49 more

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