Fix curses return key when using -k

Hello,

There is a small incoherency in curses_keys.h, which makes it fail to
emit \n when using e.g. -k fr: curses2keysym transforms \r and 0x157
into \n, but name2keysym binds \r with Return, not \n.  The patch below
fixes that.
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: NAndrzej Zaborowski <andrew.zaborowski@intel.com>

curses_keys.h

@@ -446,7 +446,7 @@ static const name2keysym_t name2keysym[] = {
     /* Special keys */
     { "BackSpace", 0x07f },
     { "Tab", '\t' },
-    { "Return", '\r' },
+    { "Return", '\n' },
     { "Right", 0x105 },
     { "Left", 0x104 },
     { "Up", 0x103 },