console.lua: don't highlight the first completion with mp.input.get

The first completion is highlighted because it is automatically inserted
when pressing Enter, but this isn't the case when the console is used
with mp.input.get, and autoselecting it can be undesirable if you're
entering arbitrary text, unlike with mpv commands where you're usually
choosing from predefined lists. So just don't highlight the first
completion for mp.input clients.

player/lua/console.lua

@@ -296,6 +296,11 @@ local function calculate_max_log_lines()
                       - 1.5)
 end
 
+local function should_highlight_completion(i)
+    return i == selected_suggestion_index or
+           (i == 1 and selected_suggestion_index == 0 and input_caller == nil)
+end
+
 -- Takes a list of strings, a max width in characters and
 -- optionally a max row count.
 -- The result contains at least one column.
@@ -377,8 +382,7 @@ local function format_table(list, width_max, rows_max)
                                   or '%-' .. math.min(column_widths[column], 99) .. 's'
             columns[column] = ass_escape(string.format(format_string, list[i]))
 
-            if i == selected_suggestion_index or
-               (i == 1 and selected_suggestion_index == 0) then
+            if should_highlight_completion(i) then
                 columns[column] = styles.selected_suggestion .. columns[column]
                                   .. '{\\b}' .. styles.suggestion
             end
@@ -491,8 +495,7 @@ local function print_to_terminal()
 
     local suggestions = ''
     for i, suggestion in ipairs(suggestion_buffer) do
-        if i == selected_suggestion_index or
-           (i == 1 and selected_suggestion_index == 0) then
+        if should_highlight_completion(i) then
             suggestions = suggestions .. terminal_styles.selected_suggestion ..
                           suggestion .. '\027[0m'
         else