Make patch_id field type 'integer'

This fiels should be integer, because it allows user clearly understand,
what exactly he should specify here. For example for patch:
https://review.fuel-infra.org/#/c/20409/ it should be number: 20409 .

Change-Id: I0e28eed0a08472ded26bbaae7c50f848b5a5bd00

murano-apps/SystemConfig/package/Classes/SystemConfig.yaml

@@ -21,7 +21,7 @@ Properties:
     Contract: $.string()
     Default: 'stable'
   patchId:
-    Contract: $.string()
+    Contract: $.int()
 Methods:
   installOnTheNode:
     Arguments:

murano-apps/SystemConfig/package/UI/ui.yaml

@@ -35,10 +35,10 @@ Forms:
           initial: stable
           type: string
           label: Branch Name
-          description: Provide branch, which should be used for for system-config repo.
+          description: Provide branch, which should be used for system-config repo.
           required: false
         - name: patchId
-          type: string
+          type: integer
           label: Patch Id
           description: Provide Id of patchset, which will be used for system-config repo.
           required: false