fix(ncmpcpp): remove deprecated options

as an upcoming version of ncmpcpp (0.9) deprecates some options,
the following options are being amended.

replace 'main_window_highlight_color' with the following:
    current_item_prefix
    current_item_suffix

replace 'active_column_color' with the following:
    current_item_inactive_column_prefix
    current_item_inactive_column_suffix

ncmpcpp/.config/ncmpcpp/config

@@ -71,12 +71,6 @@ visualizer_output_name = visualizer
 visualizer_in_stereo = yes
 #
 ##
-## Multiply received samples by given value. Very
-## useful for proper visualization of quiet music.
-##
-visualizer_sample_multiplier = 1
-#
-##
 ## Note: Below parameter defines how often ncmpcpp
 ## has to "synchronize" visualizer and audio outputs.
 ## 30 seconds is optimal value, but if you experience
@@ -200,19 +194,24 @@ message_delay_time = 4
 ## Note: colors can be nested.
 ##
 #
-#song_list_format = {%a - }{%t}|{$8%f$9}$R{$3(%l)$9}
 song_list_format = "{(%l) }{%a - }{%t}|{%f}"
 #
 #song_status_format = {{%a{ "%b"{ (%y)}} - }{%t}}|{%f}
 #
-#song_library_format = {%n - }{%t}|{%f}
 song_library_format = "{%n - }{%t}|{%f}"
 #
-#
 alternative_header_first_line_format = $b$1$aqqu$/a$9 {%t}|{%f} $1$atqq$/a$9$/b
 #
 alternative_header_second_line_format = {{$5$b%a$/b$9}{ - $7%b$9}{ ($5%y$9)}}|{%D}
 #
+current_item_prefix = $(blue)$r
+#
+current_item_suffix = $/r$(end)
+#
+current_item_inactive_column_prefix = $(white)$r
+#
+current_item_inactive_column_suffix = $/r$(end)
+#
 now_playing_prefix = $b
 #
 now_playing_suffix = $/b
@@ -339,8 +338,6 @@ progressbar_look = "▪▪▫"
 #progressbar_look = "■◣ "
 #progressbar_look = "◈◆◇"
 #
-progressbar_boldness = no
-#
 ## Available values: database, playlist.
 ##
 default_place_to_search_in = database
@@ -527,7 +524,7 @@ color1 = blue
 #
 color2 = cyan
 #
-main_window_highlight_color = white
+#main_window_highlight_color = white # deprecated in 0.9
 #
 progressbar_color = blue
 #
@@ -537,7 +534,7 @@ statusbar_color = white
 #
 alternative_ui_separator_color = white
 #
-active_column_color = blue
+#active_column_color = blue # deprecated in 0.9
 #
 window_border_color = white
 #