checker: fix error pos on default value (#6338)

vlib/net/html/dom.v

@@ -5,7 +5,7 @@ import os
 pub struct DocumentObjectModel {
 mut:
 	root           &Tag
-	constructed    bool = false
+	constructed    bool
 	btree          BTree
 	all_tags       []&Tag
 	all_attributes map[string][]&Tag

vlib/net/html/parser.v

@@ -5,11 +5,11 @@ import os
 struct LexycalAttributes {
 mut:
 	current_tag      &Tag
-	open_tag         bool = false
-	open_code        bool = false
+	open_tag         bool
+	open_code        bool
 	open_string      int
-	open_comment     bool = false
-	is_attribute     bool = false
+	open_comment     bool
+	is_attribute     bool
 	opened_code_type string
 	line_count       int
 	lexeme_builder   string
@@ -32,7 +32,7 @@ mut:
 		current_tag: &Tag{}
 	}
 	filename           string = 'direct-parse'
-	initialized        bool = false
+	initialized        bool
 	tags               []&Tag
 	debug_file         os.File
 }

vlib/net/html/tag.v

@@ -16,7 +16,7 @@ mut:
 	last_attribute     string
 	parent             &Tag = C.NULL
 	position_in_parent int
-	closed             bool = false
+	closed             bool
 	close_type         CloseTagType = .in_name
 }