Fix coding style

Fix coding style

Especially, insert a space between function name and paren.

* src/alloc.c (garbage_collect):
* src/font.h:
* src/frame.h:
* src/fringe.c:
* src/gtkutil.c (xg_set_screen):
(xg_create_frame_widgets):
(xg_create_frame_outer_widgets):
(xg_get_file_name):
(xg_get_font):
(xg_update_scrollbar_pos):
* src/image.c (image_create_bitmap_from_file):
(xpm_load_image):
* src/pgtkfns.c (pgtk_get_monitor_scale_factor):
(is_wayland_display):
(pgtk_display_info_for_name):
(INSTALL_CURSOR):
(Fx_create_frame):
(Fx_display_mm_height):
(Fx_display_mm_width):
(Fx_display_pixel_width):
(Fx_display_pixel_height):
* src/pgtkselect.c (pgtk_selection_usable):
(Fpgtk_own_selection_internal):
(Fpgtk_get_selection_internal):
* src/pgtkterm.c:
(x_set_parent_frame):
(pgtk_draw_fringe_bitmap):
(pgtk_handle_draw):
(scroll_event):
(pgtk_text_scaling_factor):
(pgtk_term_init):
* src/pgtkterm.h:
* src/window.h:
* src/xdisp.c (redisplay_internal):
(draw_glyphs_debug):
(draw_glyphs):
(note_mouse_highlight):