gsm_04_08_utils: Fix Channel Request mode for e0/e0 and neci=1

According to the specs (GSM 04.08 Table 9.9), the only possibility
if neci=1 and this cause is used is "Originating call and TCH/F is
needed"

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/openbsc/src/gsm_04_08_utils.c b/openbsc/src/gsm_04_08_utils.c
index b59d710..628c923 100644
--- a/openbsc/src/gsm_04_08_utils.c
+++ b/openbsc/src/gsm_04_08_utils.c
@@ -64,7 +64,7 @@
 	{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
 	{ 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
 	{ 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
-	{ 0xe0, 0xe0, CHREQ_T_SDCCH },
+	{ 0xe0, 0xe0, CHREQ_T_TCH_F },
 	{ 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
 	{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
 	{ 0x00, 0xf0, CHREQ_T_LOCATION_UPD },