logging: Change LLAPD category color to purple-like one

Previous dark shiny blue one is really difficult to read on the
terminal. Let's change it for some purpleish color which is far easier
to read.

Change-Id: Ia5c0860dd8d756bb24eb8972f94590bfba5bc865
diff --git a/src/logging.c b/src/logging.c
index 4517afc..1d139d5 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -159,7 +159,7 @@
 		.description = "LAPD in libosmogsm",
 		.loglevel = LOGL_NOTICE,
 		.enabled = 1,
-		.color = "\033[38;5;21m",
+		.color = "\033[38;5;12m",
 	},
 	[INT2IDX(DLINP)] = {
 		.name = "DLINP",