build: install into bin instead of sbin

Installs into bin instead of sbin per guidelines.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ie8951aa9178e00107455387d4714b1ecfe0445dc
diff --git a/Makefile.am b/Makefile.am
index 737a693..65142cc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@
-sbin_PROGRAMS = btbridged
+bin_PROGRAMS = btbridged
 
 btbridged_SOURCES = btbridged.c
 btbridged_LDFLAGS = $(SYSTEMD_LIBS)