[FIX] web: calendar: hide event span when not used

Due to commit odoo/odoo@8e48ba3eb5
a span was added to show the time before the title on a event in
month view.

DOM of event
+---------------+
| SPAN FOR TIME |
+---------------+
| TITLE         |
|               |
|               |
+---------------+

This commit, hide the empty span when is not needed, to avoid empty
blank space.

Steps to reproduce:
* Go in calendar app
* Go in view week (BUG)

closes odoo/odoo#51859

X-original-commit: 8456be44b1bc6746563cbca5366257a1da8b4a53
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
Signed-off-by: rfr-odoo <rfr-odoo@users.noreply.github.com>

addons/web/static/src/js/views/calendar/calendar_renderer.js

@@ -354,6 +354,7 @@ return AbstractRenderer.extend({
             event: event,
             record: event.extendedProps.record,
             color: this.getColor(event.extendedProps.color_index),
+            showTime: !self.hideTime && event.extendedProps.showTime,
         };
         this.qweb_context = qweb_context;
         if (_.isEmpty(qweb_context.record)) {

addons/web/static/src/xml/web_calendar.xml

@@ -13,7 +13,7 @@
 
     <t t-name="calendar-box">
         <div t-att-style="typeof color === 'string' ? ('background-color:' + color) + ';' : ''" t-attf-class="#{record.is_highlighted ? 'o_event_hightlight' : ''} #{typeof color === 'number' ? _.str.sprintf('o_calendar_color_%s', color) : 'o_calendar_color_1'}">
-            <span class="fc-time"/>
+            <span t-if="showTime" class="fc-time"/>
             <div class="o_event_title" t-esc="record.display_name"/>
         </div>
     </t>