Misc: Fix GObject property types for GLabel::xalign/yalign properties

When running under valgrind, it claims that there's used uninitialized
memory, which is set as GObject property in the code. It's for
GtkLabel::xalign. The problem was that the value in the code is
an integer, but the property itself expects float type. This fixes
the place and where a floating point is already used it annotates
the value to be float, not a double.

src/gui/importer/gcal-import-file-row.c

@@ -83,8 +83,8 @@ add_grid_row (GcalImportFileRow *self,
   title_label = g_object_new (GTK_TYPE_LABEL,
                               "visible", TRUE,
                               "label", title,
-                              "xalign", 1.0,
-                              "yalign", 0.0,
+                              "xalign", 1.0f,
+                              "yalign", 0.0f,
                               "ellipsize", PANGO_ELLIPSIZE_END,
                               "max-width-chars", 40,
                               NULL);
@@ -96,7 +96,7 @@ add_grid_row (GcalImportFileRow *self,
   value_label = g_object_new (GTK_TYPE_LABEL,
                               "visible", TRUE,
                               "label", value,
-                              "xalign", 0.0,
+                              "xalign", 0.0f,
                               "selectable", TRUE,
                               "ellipsize", PANGO_ELLIPSIZE_END,
                               "max-width-chars", 40,

src/gui/views/gcal-agenda-view.c

@@ -387,7 +387,7 @@ update_header (GtkListBoxRow *row,
 
   header = g_object_new (GTK_TYPE_LABEL,
                          "label", label,
-                         "xalign", 0,
+                         "xalign", 0.0f,
                          NULL);
   gtk_widget_add_css_class (header, "caption-heading");