Fix condition to disable submit button

Signed-off-by: Louis Chemineau <louis@chmn.me>

src/components/Composer/Composer.vue

@@ -110,7 +110,7 @@
 
 				<VisibilitySelect :type.sync="type" />
 				<div class="emptySpace" />
-				<SubmitStatusButton :type="type" :disabled="canPost || loading" @click="createPost" />
+				<SubmitStatusButton :type="type" :disabled="!canPost || loading" @click="createPost" />
 
 				<!-- <NcButton :value="currentVisibilityPostLabel"
 					:disabled="!canPost"

src/components/Composer/SubmitStatusButton.vue

@@ -23,7 +23,7 @@
 
 <template>
 	<NcButton :value="currentVisibilityPostLabel"
-		:disabled="!disabled"
+		:disabled="disabled"
 		native-type="submit"
 		type="primary"
 		@click.prevent="handleClick">