Save "repeat" as string

When loading the config from file, repeat is loaded as a string.
However, when updating it directly on the model it is stored as a bool.

Store it as a string for consistency.

Fixes #94

src/main-view/content/row-settings/run-command-row-settings.js

@@ -132,11 +132,11 @@ class RunCommandRowSettings extends Gtk.Grid {
   getSettings() {
     const actionSettings = {
       command: this.commandEntry.text,
-      repeat: this.repeatSwitch.get_active(),
+      repeat: JSON.stringify(this.repeatSwitch.get_active()),
       animation: this.animationCombo.getAnimationType(),
     };
 
-    if (actionSettings.repeat) {
+    if (this.repeatSwitch.get_active()) {
       actionSettings.decreaseCommand = this.oppositeCommandEntry.text;
     } else {
       actionSettings.on = this.onBeginEndCombo.active_id;

src/main-view/content/row-settings/send-keys-row-settings.js

@@ -135,11 +135,11 @@ class SendKeysRowSettings extends Gtk.Grid {
     const actionSettings = {
       modifiers: SendKeysRowSettings.arrayToKeySettings(this.shortcutButton.getModifiers()),
       keys: SendKeysRowSettings.arrayToKeySettings(this.shortcutButton.getKeys()),
-      repeat: this.repeatSwitch.get_active(),
+      repeat: JSON.stringify(this.repeatSwitch.get_active()),
       animation: this.animationCombo.getAnimationType(),
     };
 
-    if (actionSettings.repeat) {
+    if (this.repeatSwitch.get_active()) {
       actionSettings.decreaseKeys = SendKeysRowSettings.arrayToKeySettings([
         ...this.oppositeShortcutButton.getModifiers(),
         ...this.oppositeShortcutButton.getKeys(),