cleanup: Fix indent errors in meson.build

We are supposed to use a 2-space indent, but some inconsistencies
sneaked in over time.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/353>

data/meson.build

@@ -10,33 +10,33 @@ session_desktops = [
   session_desktop_base + '-wayland',
 ]
 
-foreach name: session_desktops
-    session_desktop = name + '.desktop'
-    if name.endswith('-xorg')
-        session_instdir = xsessiondir
-    elif name.endswith('-wayland')
-        session_instdir = wlsessiondir
-    else
-        # FIXME: The same target can not be copied into two directories.
-        #        There is a workaround in meson/session-post-install.py until proper
-        #        solution arises:
-        #        https://github.com/mesonbuild/meson/issues/2416
-        session_instdir = xsessiondir
-        #session_instdir = [ xesssiondir, wlsessiondir ]
-    endif
-    i18n.merge_file(
-      input:  session_desktop + '.in',
-      output: session_desktop,
-      po_dir: '../po',
-      install: true,
-      install_dir: session_instdir,
-      type: 'desktop',
-    )
+foreach name : session_desktops
+  session_desktop = name + '.desktop'
+  if name.endswith('-xorg')
+    session_instdir = xsessiondir
+  elif name.endswith('-wayland')
+    session_instdir = wlsessiondir
+  else
+# FIXME: The same target can not be copied into two directories.
+    #        There is a workaround in meson/session-post-install.py until proper
+    #        solution arises:
+    #        https://github.com/mesonbuild/meson/issues/2416
+    session_instdir = xsessiondir
+  #session_instdir = [ xesssiondir, wlsessiondir ]
+  endif
+  i18n.merge_file(
+    input: session_desktop + '.in',
+    output: session_desktop,
+    po_dir: '../po',
+    install: true,
+    install_dir: session_instdir,
+    type: 'desktop',
+  )
 endforeach
 
 classic_uuids = []
 foreach e : classic_extensions
-    classic_uuids += e + uuid_suffix
+  classic_uuids += e + uuid_suffix
 endforeach
 
 mode_conf = configuration_data()

meson.build

@@ -72,7 +72,7 @@ endif
 classic_mode_enabled = get_option('classic_mode')
 
 if classic_mode_enabled
-  # Sanity check: Make sure all classic extensions are enabled
+# Sanity check: Make sure all classic extensions are enabled
   foreach e : classic_extensions
     if not enabled_extensions.contains(e)
       error(f'Classic mode is enabled, but the required extension @e@ is not')
@@ -98,17 +98,13 @@ endif
 subdir('extensions')
 subdir('po')
 
-gnome.post_install(
-  glib_compile_schemas: true,
-)
+gnome.post_install(glib_compile_schemas: true)
 
-meson.add_dist_script('meson/check-version.py',
-  meson.project_version(),
-  'NEWS')
+meson.add_dist_script('meson/check-version.py', meson.project_version(), 'NEWS')
 
 summary_options = {
- 'extensions': enabled_extensions,
- 'classic_mode': get_option('classic_mode'),
+  'extensions': enabled_extensions,
+  'classic_mode': get_option('classic_mode'),
 }
 
 summary_dirs = {