Fix Travis grep script to use PCRE to actually match things (#47065)

Several of the greps were missing the `-P` switch which caused them to 
fail to match things. The EOL grep also wasn't working right so I 
replaced it with the one I added to TGMC.

code/modules/projectiles/projectile/bullets/sniper.dm

@@ -42,4 +42,4 @@
 	icon_state = "gaussstrong"
 	damage = 25
 	speed = 0.3
-	range = 16
+	range = 16

code/modules/projectiles/projectile/special/rocket.dm

@@ -72,4 +72,4 @@
 			explosion(target, 0, 1, 1, 2)
 			return BULLET_ACT_HIT
 	//if(istype(target, /turf/closed) || ismecha(target))
-	new /obj/item/broken_missile(get_turf(src), 1)
+	new /obj/item/broken_missile(get_turf(src), 1)