fix: replace $.isFunction with typeof for jQuery 3.3+ compatibility

[foodlz]

Uncaught TypeError: $.isFunction is not a function

Fix

Replace the single usage on line 29 with a direct typeof check:

// Before
var setExpr = $.isFunction( document.createElement('div').style.setExpression );

// After
var setExpr = (typeof document.createElement('div').style.setExpression === 'function');


$.isFunction(x) was always just an alias for typeof x === 'function' internally, so this is a drop-in replacement with identical behaviour across jQuery 1.x, 2.x, 3.x, and 4.x. ``````

[Copilot]

Pull request overview

Updates the BlockUI plugin to avoid relying on $.isFunction, improving compatibility with jQuery builds/versions where that helper is not present (as described by the reported runtime error).

Changes:

• Replaced the $.isFunction(...) feature-detection check with a direct typeof ... === 'function' check for style.setExpression.

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