Precision measurement of the <math display='"inline"'> <mi>W</mi> </math> boson decay branching fractions in proton-proton collisions at <math display='"inline"'> <msqrt> <mi>s</mi> </msqrt> <mo>=</mo> <mn>13</mn> <mtext>-</mtext> <mtext>-</mtext> <mi>TeV</mi> </math>