Ignore include sections when validating the config (#720)

* Don't validate `include` sections.

We need a `continue` here because `include` sections are not 'standard',
and don't have any keys to validate.

`include` sections are tangentially validated later via
`_include_config()`.

* Move checks for non-validated sections to start

Rather than looping through the whole if..elif.. block, fail fast if
we're not actually going to validate the section.

ks_includes/config.py

@@ -114,6 +114,10 @@ class KlipperScreenConfig:
         valid = True
         bools = strs = numbers = ()
         for section in self.config:
+            if section == 'DEFAULT' or section.startswith('include '):
+                # Do not validate 'DEFAULT' or 'include*' sections
+                continue
+
             if section == 'main':
                 bools = (
                     'invert_x', 'invert_y', 'invert_z', '24htime', 'only_heaters', 'show_cursor', 'confirm_estop',
@@ -153,8 +157,6 @@ class KlipperScreenConfig:
             elif section.startswith('z_calibrate_position'):
                 # This section may be deprecated in favor of moving this options under the printer section
                 numbers = ('calibrate_x_position', 'calibrate_y_position')
-            elif section == 'DEFAULT':
-                continue
             else:
                 self.errors.append(f'Section [{section}] not recognized')