challenge(formatter): handle let variable name in non-strict mode

[Conaclos]

Summary

Fix:

• js/identifier/for-of/let.js
• js/identifier/parentheses/const.js
• js/identifier/parentheses/let.js

Test Plan

Updated snapshots.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	49701	49701	0
Passed	48721	48721	0
Failed	980	980	0
Panics	0	0	0
Coverage	98.03%	98.03%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6322	6322	0
Passed	2036	2036	0
Failed	4286	4286	0
Panics	0	0	0
Coverage	32.20%	32.20%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	662	662	0
Passed	592	592	0
Failed	70	70	0
Panics	0	0	0
Coverage	89.43%	89.43%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17646	17646	0
Passed	13454	13454	0
Failed	4190	4190	0
Panics	2	2	0
Coverage	76.24%	76.24%	0.00%

[Conaclos]

!bench_formatter

[github-actions]

Formatter Benchmark Results

group                                    main                                   pr
-----                                    ----                                   --
formatter/big5-added.json                1.00    366.1±6.31µs    46.2 MB/sec    1.00    366.5±1.48µs    46.1 MB/sec
formatter/canada.json                    1.02    169.2±4.21ms    12.7 MB/sec    1.00    166.4±3.82ms    12.9 MB/sec
formatter/checker.ts                     1.00    271.0±2.90ms     9.6 MB/sec    1.03    279.5±5.98ms     9.3 MB/sec
formatter/compiler.js                    1.00    152.9±2.11ms     6.9 MB/sec    1.02    156.7±3.52ms     6.7 MB/sec
formatter/d3.min.js                      1.00    117.6±2.02ms     2.2 MB/sec    1.02    120.5±2.43ms     2.2 MB/sec
formatter/db.json                        1.00     10.6±0.07ms    17.2 MB/sec    1.05     11.2±0.14ms    16.4 MB/sec
formatter/dojo.js                        1.00      8.5±0.04ms     8.1 MB/sec    1.03      8.7±0.06ms     7.9 MB/sec
formatter/eucjp.json                     1.00    629.5±4.63µs    62.2 MB/sec    1.01   635.5±20.44µs    61.6 MB/sec
formatter/ios.d.ts                       1.00    173.9±2.17ms    10.7 MB/sec    1.00    174.7±2.80ms    10.7 MB/sec
formatter/jquery.min.js                  1.00     34.1±0.17ms     2.4 MB/sec    1.03     35.0±0.16ms     2.4 MB/sec
formatter/math.js                        1.00    238.1±4.84ms     2.7 MB/sec    1.03    245.0±3.86ms     2.6 MB/sec
formatter/package-lock.json              1.00      4.6±0.06ms    30.2 MB/sec    1.00      4.6±0.02ms    30.2 MB/sec
formatter/parser.ts                      1.00      5.9±0.02ms     8.3 MB/sec    1.03      6.0±0.04ms     8.1 MB/sec
formatter/pixi.min.js                    1.00    129.4±1.48ms     3.4 MB/sec    1.02    131.7±1.48ms     3.3 MB/sec
formatter/react-dom.production.min.js    1.00     38.6±0.32ms     3.0 MB/sec    1.02     39.6±0.35ms     2.9 MB/sec
formatter/react.production.min.js        1.00  1977.0±14.57µs     3.1 MB/sec    1.02      2.0±0.03ms     3.0 MB/sec
formatter/router.ts                      1.00      2.1±0.02ms    11.4 MB/sec    1.02      2.1±0.03ms    11.1 MB/sec
formatter/tex-chtml-full.js              1.00    304.0±4.59ms     3.0 MB/sec    1.03    311.7±5.29ms     2.9 MB/sec
formatter/three.min.js                   1.00    152.3±3.08ms     3.9 MB/sec    1.03    157.0±5.09ms     3.7 MB/sec
formatter/typescript.js                  1.00   1033.4±9.87ms     9.2 MB/sec    1.03  1065.6±11.19ms     8.9 MB/sec
formatter/vue.global.prod.js             1.00     51.6±0.33ms     2.3 MB/sec    1.03     52.9±0.55ms     2.3 MB/sec