cli: Fix error filename on script error

doc/usage.md

@@ -8,7 +8,7 @@ For more information see https://github.com/wader/fq
 
 Usage: fq [OPTIONS] [--] [EXPR] [FILE...]
 --compact,-c            Compact output
---decode,-d NAME        Decode format (default probe)
+--decode,-d NAME        Decode format (probe)
 --file,-f PATH          Read EXPR from file
 --formats               Show supported formats
 --help,-h               Show help

pkg/interp/interp.jq

@@ -581,6 +581,7 @@ def _main:
                 end
               )
             ),
+            expr_eval_path: $args_opts.expr_file,
             filenames: (
               ( if $args_opts.expr_file then $rest
                 else $rest[1:]

pkg/interp/testdata/exprfile.fqtest

@@ -2,6 +2,8 @@
 123
 /test2.jq:
 .headers[0].magic | tovalue
+/err.jq:
+asdad)
 /test.mp3:
 $ fq -n -f /test.jq
 123
@@ -9,3 +11,7 @@ $ fq -n -f /test.jq
 123
 $ fq -f /test2.jq /test.mp3
 "ID3"
+$ fq -nf /err.jq
+exitcode: 3
+stderr:
+error: /err.jq:1:6: unexpected token ")"