patch 9.0.0491: no good reason to build without the float feature

Problem:    No good reason to build without the float feature.
Solution:   Remove configure check for float and "#ifdef FEAT_FLOAT".
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 81e659e..fd427fe 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -478,9 +478,7 @@
 
   call assert_fails("call term_start(cmd, {'term_rows': -1})", 'E475:')
   call assert_fails("call term_start(cmd, {'term_rows': 1001})", 'E475:')
-  if has('float')
-    call assert_fails("call term_start(cmd, {'term_rows': 10.0})", 'E805:')
-  endif
+  call assert_fails("call term_start(cmd, {'term_rows': 10.0})", 'E805:')
 
   call delete('Xtext')
 endfunc