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/keybindings/bindings_carbon.dm

@@ -15,4 +15,4 @@
 		if("4")
 			a_intent_change("harm")
 			return
-	return ..()
+	return ..()

code/modules/keybindings/bindings_robot.dm

@@ -9,4 +9,4 @@
 		if("Q")
 			uneq_active()
 			return
-	return ..()
+	return ..()