Changes the Solarian ship prefix from "SGSV" to "SCSV" (#2831)

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## About The Pull Request
Title. Just a find and replace from "SGSV" to "SCSV"
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## Why It's Good For The Game
"SolGov" isn't an official name for the Most Serene Solar and Intersolar
Confederation, so "SolGov Space Vessel" doesn't really make sense.
"Solar Confederation Space Vessel" does make sense, though.
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## Changelog
:cl:
tweak: The Solarian ship prefix is now "SCSV," not "SGSV"
/🆑

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_maps/configs/solgov_chronicle.json

@@ -1,7 +1,7 @@
 {
 	"$schema": "https://raw.githubusercontent.com/shiptest-ss13/Shiptest/master/_maps/ship_config_schema.json",
 	"map_name": "Chronicle-class Sensor Frigate",
-	"prefix": "SGSV",
+	"prefix": "SCSV",
 	"namelists": [
 		"SOLGOV",
 		"SPACE",

_maps/configs/solgov_inkwell.json

@@ -1,7 +1,7 @@
 {
 	"$schema": "https://raw.githubusercontent.com/shiptest-ss13/Shiptest/master/_maps/ship_config_schema.json",
 	"map_name": "Inkwell-class Supply Freighter",
-	"prefix": "SGSV",
+	"prefix": "SCSV",
 	"namelists": [
 		"SOLGOV",
 		"SPACE",

_maps/configs/solgov_paracelsus.json

@@ -1,7 +1,7 @@
 {
 	"$schema": "https://raw.githubusercontent.com/shiptest-ss13/Shiptest/master/_maps/ship_config_schema.json",
 	"map_name": "Paracelsus-class Medical Corvette",
-	"prefix": "SGSV",
+	"prefix": "SCSV",
 	"namelists": [
 		"SOLGOV",
 		"SPACE",

code/__HELPERS/names.dm

@@ -252,7 +252,7 @@ GLOBAL_LIST_INIT(ship_faction_to_prefixes, list(
 		"SUNS",
 	),
 	"SolGov" = list(
-		"SGSV",
+		"SCSV",
 	),
 	"Saint-Roumain Militia" = list(
 		"SRSV",