Fix cotton resistances

[Maleclypse]

Summary

None

Purpose of change

Fixes #86499

Describe the solution

Adjusts cotton material resistances

Describe alternatives you've considered

none

Testing

Additional context

[GuardianDll]

-------------------------------------------------------------------------------
armor_protection
  no protection from physical, no protection from environmental
-------------------------------------------------------------------------------
../tests/iteminfo_test.cpp:1412
...............................................................................

../tests/iteminfo_test.cpp:1287: FAILED:
  REQUIRE( armor.resist( damage_bullet ) == Approx( bullet ) )
with expansion:
  0.05f == Approx( 0.200000003 )
with message:
  armor.typeId().str() := "test_longshirt"

-------------------------------------------------------------------------------
armor_protection
  complex protection from physical and environmental damage
-------------------------------------------------------------------------------
../tests/iteminfo_test.cpp:1527
...............................................................................

../tests/iteminfo_test.cpp:1287: FAILED:
  REQUIRE( armor.resist( damage_bullet ) == Approx( bullet ) )
with expansion:
  10.16667f == Approx( 10.6666698456 )
with message:
  armor.typeId().str() := "test_complex_tanktop"

-------------------------------------------------------------------------------
armor_stats
-------------------------------------------------------------------------------
../tests/iteminfo_test.cpp:1293
...............................................................................

../tests/iteminfo_test.cpp:1287: FAILED:
  REQUIRE( armor.resist( damage_bullet ) == Approx( bullet ) )
with expansion:
  0.025f == Approx( 0.1000000015 )
with message:
  armor.typeId().str() := "tshirt"

[BruhddyTheThird]

Does this actually fix #86499? I.e. what are the resistance values of the "Ichcahuipilli" after this change?