[IMP] mass_mailing: text_highlight snippet improved

Replace bootstrap class for text alignment with inline styles
Remove Horizontal alignment on whole snippet to allow individual 
alignment on <h3> and <p> elements.

Part-of: odoo/odoo#95940

addons/mass_mailing/views/snippets/s_text_highlight.xml

@@ -2,9 +2,9 @@
 <odoo>
 
 <template id="s_text_highlight" name="Text Highlight">
-    <div class="s_mail_text_highlight o_cc o_cc3 pt32 pb32 w-100 o_mail_snippet_general" data-snippet="s_text_highlight">
-        <h3 class=" text-center">Text Highlight</h3>
-        <p class="text-center">Put the focus on what you have to say!</p>
+    <div class="s_mail_text_highlight o_mail_snippet_general o_cc o_cc3 pt32 pb32 w-100" data-snippet="s_text_highlight">
+        <h3 style="text-align: center;">Text Highlight</h3>
+        <p style="text-align: center;">Put the focus on what you have to say!</p>
     </div>
 </template>
 

addons/mass_mailing/views/snippets_themes.xml

@@ -395,15 +395,6 @@
         <we-button class="fa fa-fw fa-angle-right" data-move-snippet="next" data-no-preview="true" data-name="move_right_opt"/>
     </div>
 
-    <!-- H-ALIGN -->
-    <div id="so_text_align" data-selector=".s_mail_text_highlight">
-        <we-button-group string="Alignment">
-            <we-button class="fa fa-fw fa-align-left" title="Left" data-select-class="text-start"/>
-            <we-button class="fa fa-fw fa-align-center" title="Center" data-select-class="text-center"/>
-            <we-button class="fa fa-fw fa-align-right" title="Right" data-select-class="text-end"/>
-        </we-button-group>
-    </div>
-
     <div id="so_width" data-selector=".s_mail_alert .s_alert, .s_mail_blockquote, .s_mail_text_highlight">
         <we-select string="Width">
             <we-button data-select-class="w-25">25%</we-button>