[jslib] Minor cleanups to JS library files. NFC - #27441
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Similar to emscripten-core#27425 but applied to the whole JS library - Replace explicit zero checks (`=== 0`, `!== 0`) with implicit truthy/falsy checks (`!x`, `x`). - Replace `.length === 0` checks with `!arr.length`. - Simplify null/undefined/zero check in `src/lib/libccall.js` to `if (str)`. - Use `for (var byte of data)` loop in `src/lib/libbrowser.js`.
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Similar to #27425 but applied to the whole JS library
=== 0,!== 0) with implicit truthy/falsy checks (!x,x)..length === 0checks with!arr.length.src/lib/libccall.jstoif (str).for (var byte of data)loop insrc/lib/libbrowser.js.