Fix override of Searchbar/ValidatedTerm::DEFAULT_PATTERN (#357)

c014cf1 changed the value of the
`DEFAULT_PATTERN` constant in `Searchbar/ValidatedTerm`, there is an
override of this constant in `TermInput/ValidatedTerm`, which previously
used the same value anyway.

Since `Searchbar/ValidatedTerm::getPattern()` uses `self` to access the
constant the override has no effect and entering invalid values in a
`TermInput` no longer shows the expected error message. Using `static`
should fix this problem.

Author: nilmerg

src/Control/SearchBar/ValidatedTerm.php

@@ -13,7 +13,7 @@ abstract class ValidatedTerm
      *
      * @var string
      */
-    public const DEFAULT_PATTERN = '(?!\s*%s\s*$).*';
+    public const DEFAULT_PATTERN = '^(?!\s*%s\s*$).*$';
 
     /** @var string The search value */
     protected $searchValue;
@@ -162,7 +162,7 @@ public function getPattern(): ?string
         }
 
         return $this->pattern ?? sprintf(
-            self::DEFAULT_PATTERN,
+            static::DEFAULT_PATTERN,
             static::escapeForHTMLPattern($this->getLabel() ?: $this->getSearchValue())
         );
     }

src/FormElement/TermInput/Term.php

@@ -5,7 +5,7 @@
 interface Term
 {
     /** @var string The default validation constraint */
-    public const DEFAULT_CONSTRAINT = '^\s*(?!%s\b).*\s*$';
+    public const DEFAULT_CONSTRAINT = \ipl\Web\Control\SearchBar\ValidatedTerm::DEFAULT_PATTERN;
 
     /**
      * Set the search value