text-freetype2: Fix 'text file' property filter

The text file filter accidentally said "All font files (*.txt)" instead
of saying "Text files (*.txt)".  Probably just a mistake from a
copy&paste.

plugins/text-freetype2/text-freetype2.c

@@ -112,7 +112,7 @@ static obs_properties_t ft2_source_properties(void)
 
 	obs_properties_add_path(props,
 		"text_file", obs_module_text("TextFile"),
-		OBS_PATH_FILE, "All font formats (*.txt);;", NULL);
+		OBS_PATH_FILE, "Text Files (*.txt);;", NULL);
 
 	obs_properties_add_color(props, "color1",
 		obs_module_text("Color1"));