Remove the unecessary lower-bound channel limit checks

This commit removes the channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT
checks because they're always false (and aren't needed to ensure the
channel limit is within-bounds).

Here's why:

1. channelLimit is unsigned, so it's always zero or greater.

2. The 'if' branch already handles the case where channelLimit is zero,
   which is an alias for the maximum limit (per the API description).

3. Therefore, the else branch is only called when channelLimit is between
   1 and ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT, inclusively.  These
   bounds are perfectly valid, so the else condition is always false and
   isn't needed.

include/enet.h

@@ -4437,8 +4437,6 @@ extern "C" {
 
         if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) {
             channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
-        } else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) {
-            channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
         }
 
         host->randomSeed                    = (enet_uint32) (size_t) host;
@@ -4690,10 +4688,7 @@ extern "C" {
     void enet_host_channel_limit(ENetHost *host, size_t channelLimit) {
         if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) {
             channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
-        } else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) {
-            channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
         }
-
         host->channelLimit = channelLimit;
     }