[IMP] theme_*: adapt images in s_striped_center_top snippet

*: avantgarde, loftspace, real_estate, zap

This commit updates the images in the `s_striped_center_top` snippet for
specific themes. The previous images were not visually good due to their
height. The new, more landscape-oriented images provide a better visual
fit, improving the overall design and aesthetics across the themes.

task-4179589
Part of task-4077427

closes odoo/design-themes#904

Related: odoo/odoo#179888
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

theme_avantgarde/views/customizations.xml

@@ -496,6 +496,10 @@
     <xpath expr="//a[hasclass('btn')]/t" position="replace" mode="inner">
         Discover More
     </xpath>
+    <!-- Image -->
+    <xpath expr="//img" position="attributes">
+        <attribute name="src">/web/image/website.s_image_title_default_image</attribute>
+    </xpath>
     <!-- Figcaption -->
     <xpath expr="//figcaption" position="replace" mode="inner">
         Where creativity knows no bounds

theme_loftspace/views/snippets/s_striped_center_top.xml

@@ -14,6 +14,10 @@
     <xpath expr="//a[hasclass('btn')]/t" position="replace" mode="inner">
         Furnish Your Home
     </xpath>
+    <!-- Image -->
+    <xpath expr="//img" position="attributes">
+        <attribute name="src">/web/image/website.s_quotes_carousel_demo_image_1</attribute>
+    </xpath>
     <!-- Figcaption -->
     <xpath expr="//figcaption" position="replace" mode="inner">
         Elegance in every piece

theme_real_estate/views/snippets/s_striped_center_top.xml

@@ -17,6 +17,7 @@
     <!-- Image -->
     <xpath expr="//img" position="attributes">
         <attribute name="class" remove="rounded" separator=" "/>
+        <attribute name="src">/web/image/website.s_accordion_image_default_image</attribute>
     </xpath>
     <!-- Figcaption -->
     <xpath expr="//figcaption" position="replace" mode="inner">

theme_zap/views/snippets/s_striped_center_top.xml

@@ -20,7 +20,7 @@
     </xpath>
     <!-- Image -->
     <xpath expr="//img" position="attributes">
-        <attribute name="src">/web/image/website.s_three_columns_default_image_2</attribute>
+        <attribute name="src">/web/image/website.s_masonry_block_default_image_2</attribute>
     </xpath>
 </template>