add a small test for the parser error as well

vlib/v/parser/tests/tmpl/include.txt

@@ -0,0 +1,5 @@
+some text
+
+@include abc.txt
+
+some more text

vlib/v/parser/tests/tmpl_include_without_quotes.out

@@ -0,0 +1,7 @@
+vlib/v/parser/tests/tmpl/include.txt:3:10: error: path for @include must be quoted with ' or "
+    1 | some text
+    2 | 
+    3 | @include abc.txt
+      |          ~~~~~~~
+    4 | 
+    5 | some more text

vlib/v/parser/tests/tmpl_include_without_quotes.vv

@@ -0,0 +1,6 @@
+fn main() {
+	a := 'foo'
+	b := 'bar'
+	result := $tmpl('tmpl/include.txt')
+	assert result.trim_space() == 'foo\nbar'
+}

vlib/v/parser/tmpl.v

@@ -179,7 +179,8 @@ fn vweb_tmpl_${fn_name}() string {
 						len: s.len
 						line_nr: tline_number
 						pos: start_of_line_pos + position + s.len
-						last_line: lines.len
+						col: position + s.len
+						last_line: lines.len + 1
 					}
 					reporter: .parser
 				})

vlib/v/tests/tmpl/include.txt

@@ -1,2 +1,2 @@
 @include "a.txt"
-@include 'b.txt'
+@include 'b.txt'