Update Checkstyle config to match Filament (FabricMC#744)

Allows the use of var in all locations.

checkstyle.xml

@@ -3,6 +3,8 @@
 <module name="Checker">
 	<property name="charset" value="UTF-8"/>
 	<property name="fileExtensions" value="java"/>
+	<property name="localeLanguage" value="en"/>
+	<property name="localeCountry" value="US"/>
 
 	<module name="NewlineAtEndOfFile"/>
 
@@ -158,10 +160,5 @@
 		<module name="AtclauseOrder">
 			<property name="tagOrder" value="@param,@return,@throws,@deprecated"/>
 		</module>
-
-		<!-- Prevent var for all cases other than new instance creation -->
-		<module name="MatchXpath">
-			<property name="query" value="//VARIABLE_DEF[./TYPE/IDENT[@text='var'] and not(./ASSIGN/EXPR/LITERAL_NEW)]"/>
-		</module>
 	</module>
-</module>
+</module>