Reverts flare buff from #4229 (#5709)

# About the pull request
Reverts the flare buff that came alongside fancy lighting from 7 range
to 5
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# Explain why it's good for the game
Since the fancy lighting change, other factors have come in to play,
most notably the rise in the flare gun, the increase in pouch storage
and the buff to armour light, making controlling lighting incredibly
easy just with 1, with them being infinitely more difficult to deal with
than flashlights and a lot more accessible while being safer to use with
other utility.

I believe it is fair to revert the buff especially considering how
bright flares are in real life, being more of a concentrated amount of
light, not overpowering a military issue flashlight 10 fold without the
cone effect to boot.

With how considerable the nerf would be I doubt they will fall into the
realm of uselessness, with them still being a great option for scouting
ahead of what is visible and still being very easy to carry, just
needing an additional flare or so for a room that would be lit up by
one.

# Testing Photographs and Procedure
https://imgur.com/5VNOQrh

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# Changelog

:cl:
balance: Reverted flare range buff 7->5 tiles
/:cl:

code/game/objects/items/devices/flashlight.dm

@@ -238,7 +238,7 @@
 	desc = "A red USCM issued flare. There are instructions on the side, it reads 'pull cord, make light'."
 	w_class = SIZE_SMALL
 	light_power = 2
-	light_range = 7
+	light_range = 5
 	icon_state = "flare"
 	item_state = "flare"
 	actions = list() //just pull it manually, neckbeard.