[SettingsProvider] fix font size scale validator

BUG: 156260178
Test: builds
Change-Id: I32f3b7ece78ec8cc97c52a0484151a6a777aa9da
Merged-In: I32f3b7ece78ec8cc97c52a0484151a6a777aa9da

packages/SettingsProvider/src/android/provider/settings/validators/SystemSettingsValidators.java

@@ -89,15 +89,7 @@ public class SystemSettingsValidators {
                         return value == null || value.length() < MAX_LENGTH;
                     }
                 });
-        VALIDATORS.put(
-                System.FONT_SCALE,
-                value -> {
-                    try {
-                        return Float.parseFloat(value) >= 0;
-                    } catch (NumberFormatException | NullPointerException e) {
-                        return false;
-                    }
-                });
+        VALIDATORS.put(System.FONT_SCALE, new InclusiveFloatRangeValidator(0.85f, 1.3f));
         VALIDATORS.put(System.DIM_SCREEN, BOOLEAN_VALIDATOR);
         VALIDATORS.put(
                 System.DISPLAY_COLOR_MODE,