Initialize xrm during init

Initializing xrm is required only once. Everything else would be
overhead.

src/x11/screen.c

@@ -59,8 +59,6 @@ static double screen_dpi_get_from_xft(void)
         if (screen_dpi_xft_cache == -DBL_MAX) {
                 screen_dpi_xft_cache = 0;
 
-                XrmInitialize();
-
                 char *xrmType;
                 XrmValue xrmValue;
                 XrmDatabase db = XrmGetDatabase(xctx.dpy);

src/x11/x.c

@@ -471,6 +471,8 @@ void x_setup(void)
 
         init_screens();
         x_shortcut_grab(&settings.history_ks);
+
+        XrmInitialize();
 }
 
 struct geometry x_parse_geometry(const char *geom_str)