Fix braces in if-else statements

From the Linux kernel coding guidelines:

    Do not unnecessarily use braces where a single statement will do.
    [...] This does not apply if one branch of a conditional statement
    is a single statement. Use braces in both branches.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/utf8.c

@@ -313,8 +313,9 @@ int utf8_width(char *s)
         return utf8_widthtab[cur].width;
       else
         low = cur + 1;
-    } else
+    } else {
       high = cur - 1;
+    }
   }
   while (low <= high);