Add variant needles for current Flatpak open/save dialogs

The open/save dialogs for Flatpak apps in current F36 (and
probably Rawhide, but can't tell due to another bug) look a bit
odd: https://github.com/fedora-silverblue/issue-tracker/issues/245
This adds variant needles to handle various differences there.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/gnome/apps/evince/evince_documents-flatpak-20220315.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "xpos": 89,
+      "type": "match",
+      "width": 15,
+      "ypos": 328,
+      "height": 20
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "evince_documents"
+  ]
+}

needles/gnome/apps/evince/evince_file_select_pdf-flatpak-grey-20220316.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "xpos": 271,
+      "height": 16,
+      "ypos": 319,
+      "width": 68,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "evince_file_select_pdf"
+  ]
+}

needles/gnome/gnome_button_open-boldblue-20220316.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "height": 16,
+      "ypos": 206,
+      "width": 42,
+      "type": "match",
+      "xpos": 886
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "gnome_button_open"
+  ]
+}

needles/gnome/gnome_button_save-boldblue-20220316.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "width": 40,
+      "ypos": 227,
+      "height": 20,
+      "xpos": 891
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "gnome_button_save_blue"
+  ]
+}