vim-patch:9.0.1507: assert message is confusing with boolean result

Problem:    Assert message is confusing with boolean result.  assert_inrange()
            replaces message instead of adding it.
Solution:   Don't put quotes around expected boolean value.  Append message
            for assert_inrange(). (closes vim/vim#12342, closes vim/vim#12341)

53f5e51628

Move assert_type_T to testing.c and remove ASSERT_INRANGE.

src/nvim/eval.h

@@ -229,16 +229,6 @@ typedef struct {
   Callback callback;
 } timer_T;
 
-/// Type of assert_* check being performed
-typedef enum {
-  ASSERT_EQUAL,
-  ASSERT_NOTEQUAL,
-  ASSERT_MATCH,
-  ASSERT_NOTMATCH,
-  ASSERT_INRANGE,
-  ASSERT_OTHER,
-} assert_type_T;
-
 /// types for expressions.
 typedef enum {
   EXPR_UNKNOWN = 0,