patch 8.1.2371: FEAT_TEXT_PROP is a confusing name

Problem:    FEAT_TEXT_PROP is a confusing name.
Solution:   Use FEAT_PROP_POPUP. (Naruhiko Nishino, closes #5291)
diff --git a/src/misc2.c b/src/misc2.c
index 8903b0d..80731f0 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -1148,7 +1148,7 @@
     /* Clear cmdline history. */
     p_hi = 0;
     init_history();
-# ifdef FEAT_TEXT_PROP
+# ifdef FEAT_PROP_POPUP
     clear_global_prop_types();
 # endif