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/process/meson.build

@@ -4,11 +4,11 @@ process_tests = [
     ['process_test',   'process_test.cpp'],
 ]
 
-foreach t : process_tests
-    exe = executable(t[0], t[1],
+foreach test : process_tests
+    exe = executable(test[0], test[1],
                      dependencies : libcamera_private,
                      link_with : test_libraries,
                      include_directories : test_includes_internal)
 
-    test(t[0], exe, suite : 'process', is_parallel : false)
+    test(test[0], exe, suite : 'process', is_parallel : false)
 endforeach