fix(tiger): add 'ft' modeline in highlight corpus

tests/query/highlights/tiger/built-ins.tig

@@ -41,3 +41,4 @@ in
   b := print
   /*   ^ variable */
 end
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/comment.tig

@@ -3,3 +3,4 @@
             ^ comment
                                 ^ comment
  */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/functions.tig

@@ -6,3 +6,4 @@ function func(a: int) : int = (print("Hello World!"); a)
 /*       ^ function */
 /*            ^ parameter */
 /*                             ^ function.builtin */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/identifiers.tig

@@ -27,3 +27,4 @@ primitive func(a: int, b: string) : array
 /*                     ^ parameter */
 /*                        ^ type.builtin */
 /*                                  ^ type */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/imports.tig

@@ -1,3 +1,4 @@
 import "lib.tih"
 /* <- keyword */
 /*      ^ string.special */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/keywords.tig

@@ -39,3 +39,4 @@ in
 
 end
 /* <- keyword */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/literals.tig

@@ -6,3 +6,4 @@ nil
 /* <- string
              ^ string.escape
 */
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/meta-variables.tig

@@ -11,3 +11,4 @@ in
   _exp(42)
   /* <- keyword */
 end
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/object-oriented.tig

@@ -26,3 +26,4 @@ in
   object.meth()
   /*     ^ method */
 end
+/* vim: set ft=tiger: */

tests/query/highlights/tiger/operators.tig

@@ -46,3 +46,4 @@ in
   )
   /* <- punctuation.bracket */
 end
+/* vim: set ft=tiger: */