checker: fix missing check for or expr on string interpolation

vlib/v/checker/str.v

@@ -45,6 +45,7 @@ fn (mut c Checker) string_inter_lit(mut node ast.StringInterLiteral) ast.Type {
 	c.inside_interface_deref = true
 	for i, mut expr in node.exprs {
 		mut ftyp := c.expr(mut expr)
+		ftyp = c.check_expr_option_or_result_call(expr, ftyp)
 		if c.comptime.is_comptime_var(expr) {
 			ctyp := c.comptime.get_comptime_var_type(expr)
 			if ctyp != ast.void_type {

vlib/v/checker/tests/wrong_or_expr_err.out

@@ -0,0 +1,6 @@
+vlib/v/checker/tests/wrong_or_expr_err.vv:7:31: error: wrong return type `string` in the `or {}` block, expected `i16`
+    5 |         return 1
+    6 |     }
+    7 |     println('${get_number() or { '1' }}')
+      |                                  ~~~
+    8 | }

vlib/v/checker/tests/wrong_or_expr_err.vv

@@ -0,0 +1,8 @@
+module main
+
+fn main() {
+	get_number := fn () ?i16 {
+		return 1
+	}
+	println('${get_number() or { '1' }}')
+}

vlib/v/tests/results_test.v

@@ -21,7 +21,7 @@ fn test_return_err_var() {
 }
 
 fn test_str() {
-	assert '${foo()}' == 'Result(1)'
+	assert '${foo() or { 3 }}' == '1'
 }
 
 fn result_void(err bool) ! {

vlib/v/tests/str_gen_test.v

@@ -333,7 +333,7 @@ fn create_option_err() !string {
 }
 
 fn test_result_err() {
-	assert '${create_option_err()}' == 'Result(error: this is an error)'
+	assert '${create_option_err() or { 'Result(error: this is an error)' }}' == 'Result(error: this is an error)'
 }
 
 fn create_option_none() ?string {