fix kyaml issue where dropping Style created issues

dropping the node style creates a compatibility issue where quotes around "on" are dropped
because yaml.v3 interprets it as a string.

other yaml parsers interpret on as a bool value, and parse it as a bool rather than string.

fix: retain the original style so it is kept as quoted.

- fmt: don't drop the styles
- merge2: keep the style when merging elements
- setting a field: if changing the value of a scalar field, retain its style by default

kyaml/yaml/merge3/element_test.go

@@ -174,8 +174,7 @@ kind: Deployment
 containers:
 - name: foo
   image: foo:bar
-  command:
-  - run2.sh
+  command: ['run2.sh']
 `, nil},
 
 	//
@@ -206,8 +205,7 @@ kind: Deployment
 containers:
 - name: foo
   image: foo:bar
-  command:
-  - run2.sh
+  command: ['run2.sh']
 `, nil},
 
 	//
@@ -239,8 +237,7 @@ kind: Deployment
 containers:
 - name: foo
   image: foo:bar
-  command:
-  - run2.sh
+  command: ['run2.sh']
 `, nil},
 
 	//
@@ -367,8 +364,7 @@ kind: Deployment
 containers:
 - name: foo
   image: foo:bar
-  command:
-  - run.sh
+  command: ['run.sh']
 `, nil},
 
 	//