TextBox: Fix readonly input border state (T1217197) #1

Job	Run time
Get changed demos	12s
Build DevExtreme	13m 47s
Build Demos	3m 50s
Lint code base (excluding demos)	33s
Lint demos (1/4)	14s
Lint demos (2/4)	18s
Lint demos (3/4)	13s
Lint demos (4/4)	14s
testcafe-react(1/4)	19m 39s
Check generated demos (1/5)	4m 38s
Check generated demos (2/5)	4m 30s
testcafe-react(2/4)	14m 31s
Check generated demos (3/5)	4m 36s
testcafe-react(3/4)	13m 22s
Check generated demos (4/5)	4m 55s
testcafe-react(4/4)	12m 10s
Check generated demos (5/5)	4m 48s
testcafe-vue(1/4)	25m 2s
testcafe-vue(2/4)	32m 36s
testcafe-vue(3/4)	21m 39s
testcafe-vue(4/4)	20m 31s
testcafe-angular(1/4)	33m 30s
testcafe-angular(2/4)	39m 24s
testcafe-angular(3/4)	53m 5s
testcafe-angular(4/4)	25m 40s
	5h 53m 57s

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