[IMP] spreadsheet: change global filter icon

Change the global filter icon from the `fa-search` to something more
filter-like.

Also use the same icon in shared dashboard.

closes odoo/odoo#139164

Task: 3560817
Related: odoo/enterprise#49166
Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>

addons/spreadsheet/static/src/o_spreadsheet/icons.xml

@@ -12,4 +12,11 @@
       <path fill="currentColor" d="M2 10.5h1.5V15h11v-4.5H16v6H2M5.5 8H8V1h2v7h2.5L9 11.5"/>
     </svg>
   </t>
+  <t t-name="o-spreadsheet-Icon.GLOBAL_FILTERS">
+    <svg width="20" height="20" viewbox="0 0 20 20">
+      <path
+        fill="currentColor"
+        d="M1 3h12L7 9M5.5 6h3v11l-3-3M14 4h4v2h-4m-3 3h7v2h-7m0 3h7v2h-7"/>
+    </svg>
+  </t>
 </templates>

addons/spreadsheet/static/src/public_readonly_app/public_readonly.xml

@@ -2,8 +2,11 @@
 <templates xml:space="preserve">
 
     <t t-name="spreadsheet.PublicReadonlySpreadsheet">
-        <div t-if="showFilterButton" t-on-click="toggleGlobalFilters" class="o-public-spreadsheet-filter-button position-absolute bg-white fw-bold my-0 mx-3 p-2 fs-6 rounded">
-            <i class="fa fa-fw fa-filter me-1"/>Show Filters
+        <div t-if="showFilterButton"
+            t-on-click="toggleGlobalFilters"
+            class="o-public-spreadsheet-filter-button position-absolute bg-white fw-bold my-0 mx-3 p-2 fs-6 rounded">
+            <t t-call="o-spreadsheet-Icon.GLOBAL_FILTERS"/>
+            <span class="ps-1">Show Filters</span>
         </div>
         <div class="o-public-spreadsheet-filters d-flex flex-column flex-nowrap overflow-y-scroll p-3" t-if="state.isFilterShown">
             <div class="o-public-spreadsheet-filters-title d-flex justify-content-between align-items-center">