[FIX] web: advanced search on floats with ',' as decimal separator

When using another decimal separator than `.` (dot)
in the language settings,
it wasn't possible to build an advanced search specifying
the decimals.

e.g. with a language with decimal separator `,` and thousand
separator `.`,
if you want to search invoices with amount total 366,38
The advanced search "Total" "is equal to" obliged you
to enter your number with `.` as separator (366.38),
and then, when entering the search, the `.` was
regarded as the thousand separator, giving as domain
`('amount_total', '=', 36638)`, which is not what you asked.

opw-634201

PS: The `|| '.'` in the xml template are only for
retro-compatibility, so if the server sources are
updated, but the browser cache is not refreshed
(meaning the Javascript code isn't refreshed, and,
therefore, `widget.decimal_point is undefined)
it still works.

addons/web/static/src/js/search.js

@@ -2150,6 +2150,10 @@ instance.web.search.ExtendedSearchProposition.Float = instance.web.search.Extend
         {value: "∃", text: _lt("is set")},
         {value: "∄", text: _lt("is not set")}
     ],
+    init: function (parent) {
+        this._super(parent);
+        this.decimal_point = instance.web._t.database.parameters.decimal_point;
+    },
     toString: function () {
         return this.$el.val();
     },

addons/web/static/src/xml/base.xml

@@ -1673,7 +1673,11 @@
     <input type="number" class="field_integer" value = "0" step="1"/>
 </t>
 <t t-name="SearchView.extended_search.proposition.float">
-    <input type="number" class="field_float" value = "0.0" step="0.01"/>
+    <input class="field_float"
+        t-att-type="widget.decimal_point === '.' ? 'number' : 'text'"
+        t-attf-title="Number using #{widget.decimal_point  || '.' } as decimal separator."
+        t-attf-pattern="[0-9]+([\\#{widget.decimal_point || '.' }][0-9]+)?"
+        t-attf-value="0#{widget.decimal_point || '.' }0" step="0.01"/>
 </t>
 <t t-name="SearchView.extended_search.proposition.selection">
     <select>