meson: Fix space around colon issues

The meson style, which libcamera follows, recommends a space before
colons in function parameters. Fix the style violations through the
project.

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

test/gstreamer/meson.build

@@ -9,7 +9,7 @@ gstreamer_tests = [
     {'name': 'multi_stream_test', 'sources': ['gstreamer_multi_stream_test.cpp']},
     {'name': 'device_provider_test', 'sources': ['gstreamer_device_provider_test.cpp']},
 ]
-gstreamer_dep = dependency('gstreamer-1.0', required: true)
+gstreamer_dep = dependency('gstreamer-1.0', required : true)
 
 foreach test : gstreamer_tests
     exe = executable(test['name'], test['sources'], 'gstreamer_test.cpp',