Tweak Skrell Strength (#22832)

The conditioning skill was a little too harsh on Skrell, who suffered
heavily from being the lightest and smallest species, which made them
have extremely unfavorable interactions with mass and fireman carrying.
This PR gives them a higher than normal mob strength modifier to offset
their low mass, so that they can at least fireman carry a human without
requiring the conditioning skill. This makes both standard and Axiori
skrell start at a similar level as a human's limits for carrying before
the Conditioning skill is considered.

code/modules/mob/living/carbon/human/species/station/skrell/skrell.dm

@@ -112,6 +112,7 @@
 	has_psionics = PSI_RANK_SENSITIVE
 	character_creation_psi_points = 2
 	mass_modifier = REFERENCE_MASS_SKRELL / REFERENCE_MASS_HUMAN
+	mob_strength = 1.8 // Offset for very low mass.
 
 /datum/species/skrell/handle_trail(var/mob/living/carbon/human/H, var/turf/T)
 	var/list/trail_info = ..()

code/modules/mob/living/carbon/human/species/station/skrell/skrell_subspecies.dm

@@ -25,3 +25,4 @@
 	max_pulse = 140 // Species default 130
 
 	mass_modifier = REFERENCE_MASS_SKRELL_AXIORI / REFERENCE_MASS_HUMAN
+	mob_strength = 1.5 // Offset for very low mass.