pingerr: Make configuration recommendation header generic

Remove "FOR OPENWRT" from the recommendation header since pingerr.sh
is for Linux/macOS systems, not OpenWRT (that's pingerr_ash.sh).

Signed-off-by: Panchajanya1999 <kernel@panchajanya.dev>

Author: Panchajanya1999

pingerr.sh

@@ -837,7 +837,7 @@ echo ""
 echo -e "${YELLOW}Test completed!${NC}"
 echo ""
 echo -e "${BLUE}═══════════════════════════════════════════════════════════════════════════════════════════════════════════════${NC}"
-echo -e "${GREEN}CONFIGURATION RECOMMENDATION FOR OPENWRT:${NC}"
+echo -e "${GREEN}CONFIGURATION RECOMMENDATION:${NC}"
 echo ""
 
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