LibJS: Tweak error message in the NumberToBigInt abstract operation

This is no longer specific to the BigInt() constructor, so it shouldn't
be mentioning an 'argument' that we might not have.

Userland/Libraries/LibJS/Runtime/BigInt.cpp

@@ -34,7 +34,7 @@ BigInt* number_to_bigint(GlobalObject& global_object, Value number)
 
     // 1. If IsIntegralNumber(number) is false, throw a RangeError exception.
     if (!number.is_integral_number()) {
-        vm.throw_exception<RangeError>(global_object, ErrorType::BigIntIntArgument);
+        vm.throw_exception<RangeError>(global_object, ErrorType::BigIntFromNonIntegral);
         return {};
     }
 

Userland/Libraries/LibJS/Runtime/ErrorTypes.h

@@ -12,7 +12,7 @@
     M(AccessorValueOrWritable, "Accessor property descriptor cannot specify a value or writable key")                                   \
     M(BigIntBadOperator, "Cannot use {} operator with BigInt")                                                                          \
     M(BigIntBadOperatorOtherType, "Cannot use {} operator with BigInt and other type")                                                  \
-    M(BigIntIntArgument, "BigInt argument must be an integer")                                                                          \
+    M(BigIntFromNonIntegral, "Cannot convert non-integral number to BigInt")                                                            \
     M(BigIntInvalidValue, "Invalid value for BigInt: {}")                                                                               \
     M(BindingNotInitialized, "Binding {} is not initialized")                                                                           \
     M(ClassConstructorWithoutNew, "Class constructor {} must be called with 'new'")                                                     \

Userland/Libraries/LibJS/Tests/builtins/BigInt/BigInt.js

@@ -62,7 +62,7 @@ describe("errors", () => {
         [1.23, Infinity, -Infinity, NaN].forEach(value => {
             expect(() => {
                 BigInt(value);
-            }).toThrowWithMessage(RangeError, "BigInt argument must be an integer");
+            }).toThrowWithMessage(RangeError, "Cannot convert non-integral number to BigInt");
         });
     });
 });