Search for Higgs boson pair production in the two bottom quarks plus two photons final state in <math display='"inline"'> <mi>p</mi> <mi>p</mi> </math> collisions at <math display='"inline"'> <msqrt> <mi>s</mi> </msqrt> <mo>=</mo> <mn>13</mn> <mtext>-</mtext> <mtext>-</mtext></math>