Fix build with specific option combination.

[fernape]

With at least double buffer, mouse events, lua imlib2, xinerama and wayland support disabled, the #ifdef combination in the code fails to build:

[snip]

/wrkdirs/usr/ports/sysutils/conky-awesome/work/conky-1.21.0/src/llua.h:62:6: error: variable has incomplete type 'void' void llua_setup_window_table(conky::rect<int> text_rect);
     ^
/wrkdirs/usr/ports/sysutils/conky-awesome/work/conky-1.21.0/src/llua.h:62:37: error: no member named 'rect' in namespace 'conky' void llua_setup_window_table(conky::rect<int> text_rect);
                             ~~~~~~~^
[snip]

/wrkdirs/usr/ports/sysutils/conky-awesome/work/conky-1.21.0/src/x11-settings.cc:80:52: error: no member named 'width' in 'conky_x11_window'
      XCreatePixmap(display, window.window, window.width + 1, window.height + 1,
                                            ~~~~~~ ^
/wrkdirs/usr/ports/sysutils/conky-awesome/work/conky-1.21.0/src/x11-settings.cc:80:70: error: no member named 'height' in 'conky_x11_window'
      XCreatePixmap(display, window.window, window.width + 1, window.height + 1,
                                                              ~~~~~~ ^

This commit fixes the usage of the geometry field in conky_x11_window.

Checklist

• I have described the changes
• I have linked to any relevant GitHub issues, if applicable
• Documentation in doc/ has been updated
• All new code is licensed under GPLv3

Description

• Describe the changes, why they were necessary, etc
• Describe how the changes will affect existing behaviour.
• Describe how you tested and validated your changes.
• Include any relevant screenshots/evidence demonstrating that the changes work and have been tested.

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[Caellian]

Good fixes for code that was left behind after #1910.