qmk find: Fix handling of keys with dots in filter functions

Filters like `-f "exists(rgb_matrix.split_count")` broke after qmk#22887,
because a plain dict was used instead of the `dotty` wrapper, therefore
only keys with a single component worked.  Fix the implementation of
filtering functions to use the `dotty` wrapper properly, so that keys
with dots could be used in functions again.

lib/python/qmk/search.py

@@ -74,28 +74,30 @@ class Exists(FilterFunction):
     func_name = "exists"
 
     def apply(self, target_info: KeyboardKeymapDesc) -> bool:
-        return self.key in target_info.data
+        return self.key in target_info.dotty
 
 
 class Absent(FilterFunction):
     func_name = "absent"
 
     def apply(self, target_info: KeyboardKeymapDesc) -> bool:
-        return self.key not in target_info.data
+        return self.key not in target_info.dotty
 
 
 class Length(FilterFunction):
     func_name = "length"
 
     def apply(self, target_info: KeyboardKeymapDesc) -> bool:
-        return (self.key in target_info.data and len(target_info.data[self.key]) == int(self.value))
+        info_dotty = target_info.dotty
+        return (self.key in info_dotty and len(info_dotty[self.key]) == int(self.value))
 
 
 class Contains(FilterFunction):
     func_name = "contains"
 
     def apply(self, target_info: KeyboardKeymapDesc) -> bool:
-        return (self.key in target_info.data and self.value in target_info.data[self.key])
+        info_dotty = target_info.dotty
+        return (self.key in info_dotty and self.value in info_dotty[self.key])
 
 
 def _get_filter_class(func_name: str, key: str, value: str) -> Optional[FilterFunction]: