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/power/singularity/investigate.dm

@@ -1,4 +1,4 @@
 /area/engine/engineering/poweralert(state, source)
 	if (state != poweralm)
 		investigate_log("has a power alarm!", INVESTIGATE_SINGULO)
-	..()
+	..()