patch 8.2.3797: no good reason to limit the message history in tiny version

Problem:    No good reason to limit the message history in the tiny version.
Solution:   Always use 200.
diff --git a/src/feature.h b/src/feature.h
index 52a2e44..fa79d7a 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -32,7 +32,7 @@
  * ==============
  *
  * +tiny		almost no features enabled, not even multiple windows
- * +small		few features enabled, as basic as possible
+ * +small		as tiny plus cmdline window
  * +normal		A default selection of features enabled
  * +big			many features enabled, as rich as possible.
  * +huge		all possible features enabled.
@@ -120,13 +120,9 @@
  */
 
 /*
- * Message history is fixed at 200 message, 20 for the tiny version.
+ * Message history is fixed at 200 messages.
  */
-#ifdef FEAT_SMALL
-# define MAX_MSG_HIST_LEN 200
-#else
-# define MAX_MSG_HIST_LEN 20
-#endif
+#define MAX_MSG_HIST_LEN 200
 
 #if defined(FEAT_SMALL)
 # define FEAT_CMDWIN