don't say "install complete" when it really isn't

Change the recovery UI so that when there is a hboot or radio update
pending (which the user most do a home+back reboot to actually
install), the UI tells them so, instead of saying "Install from sdcard
complete."
diff --git a/install.c b/install.c
index 4dcfe75..e7db2a8 100644
--- a/install.c
+++ b/install.c
@@ -105,7 +105,7 @@
         return INSTALL_ERROR;
     }
 
-    ui_print("Installation complete.\n");
+    LOGI("Installation complete.\n");
     return INSTALL_SUCCESS;
 }