base-files: uppercase default hostname: LEDE

The name will appear in shell prompt and LuCI page title.  Uppercase
letters seem to be more vigorous

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/base-files/files/bin/config_generate

@@ -226,7 +226,7 @@ generate_static_system() {
 	uci -q batch <<-EOF
 		delete system.@system[0]
 		add system system
-		set system.@system[-1].hostname='lede'
+		set system.@system[-1].hostname='LEDE'
 		set system.@system[-1].timezone='UTC'
 		set system.@system[-1].ttylogin='0'
 		set system.@system[-1].log_size='64'