test: Rename 't' to 'test' in meson.build

The 't' name is very short and not very explicit. Rename it to 'test'
instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

test/controls/meson.build

@@ -7,10 +7,10 @@ control_tests = [
     ['control_value',               'control_value.cpp'],
 ]
 
-foreach t : control_tests
-    exe = executable(t[0], t[1],
+foreach test : control_tests
+    exe = executable(test[0], test[1],
                      dependencies : libcamera_public,
                      link_with : test_libraries,
                      include_directories : test_includes_internal)
-    test(t[0], exe, suite : 'controls', is_parallel : false)
+    test(test[0], exe, suite : 'controls', is_parallel : false)
 endforeach