Flatpak: Omit quote when possible (#295)

Flatpak External Data Checker seems to force this style, which is annoying though, so switch to it now to avoid manifest update and coding style update from being in one commit

build-aux/appcenter/com.github.ryonakano.reco.Devel.yml

@@ -4,12 +4,12 @@ runtime-version: '8'
 sdk: io.elementary.Sdk
 command: com.github.ryonakano.reco.Devel
 finish-args:
-  - '--device=all'
-  - '--share=ipc'
-  - '--socket=wayland'
-  - '--socket=fallback-x11'
-  - '--socket=pulseaudio'
-  - '--env=GST_PLUGIN_PATH_1_0=/app/lib/gstreamer-1.0'
+  - --device=all
+  - --share=ipc
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --socket=pulseaudio
+  - --env=GST_PLUGIN_PATH_1_0=/app/lib/gstreamer-1.0
 modules:
   - name: live-chart
     buildsystem: meson
@@ -21,7 +21,7 @@ modules:
   - name: gst-libav
     buildsystem: meson
     config-opts:
-      - '-Ddoc=disabled'
+      - -Ddoc=disabled
     sources:
       - type: archive
         # we need to use the same version with gstreamer included in the sdk
@@ -38,8 +38,8 @@ modules:
   - name: reco
     buildsystem: meson
     config-opts:
-      - '-Duse_submodule=false'
-      - '-Ddevelopment=true'
+      - -Duse_submodule=false
+      - -Ddevelopment=true
     sources:
       - type: dir
         path: ../../

com.github.ryonakano.reco.yml

@@ -4,13 +4,13 @@ runtime-version: '8'
 sdk: io.elementary.Sdk
 command: com.github.ryonakano.reco
 finish-args:
-  - '--device=all'
-  - '--share=ipc'
-  - '--socket=wayland'
-  - '--socket=fallback-x11'
-  - '--socket=pulseaudio'
-  - '--env=GST_PLUGIN_PATH_1_0=/app/lib/gstreamer-1.0'
-  - '--metadata=X-DConf=migrate-path=/com/github/ryonakano/reco/'
+  - --device=all
+  - --share=ipc
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --socket=pulseaudio
+  - --env=GST_PLUGIN_PATH_1_0=/app/lib/gstreamer-1.0
+  - --metadata=X-DConf=migrate-path=/com/github/ryonakano/reco/
 modules:
   - name: live-chart
     buildsystem: meson
@@ -22,7 +22,7 @@ modules:
   - name: gst-libav
     buildsystem: meson
     config-opts:
-      - '-Ddoc=disabled'
+      - -Ddoc=disabled
     sources:
       - type: archive
         # we need to use the same version with gstreamer included in the sdk
@@ -39,7 +39,7 @@ modules:
   - name: reco
     buildsystem: meson
     config-opts:
-      - '-Duse_submodule=false'
+      - -Duse_submodule=false
     sources:
       - type: dir
         path: .