Fix ambiguous std::abs call in confidenceCC#3710
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std::abs<CT>(x) with an explicit template argument is rejected as ambiguous by newer libc++ (e.g. the macOS 26 SDK), which brings the integer abs overloads into scope. s1var/validsVar are already CT, so drop the argument and let std::abs resolve the <cmath> overload.
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Description
std::abs(x) with an explicit template argument is rejected as ambiguous by newer libc++ (e.g. the macOS 26 SDK), which brings the integer abs overloads into scope. s1var/validsVar are already CT, so drop the argument and let std::abs resolve the overload.
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