Revert "Added AllowNullableArrayArgsInMain (1.4+) language setting"

#KT-35965 Fixed

idea/testData/run/MainInTest/module/src/mainNullableArgsInArray_after.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +AllowNullableArrayArgsInMain
 
-fun main(args: Array<String?>) { // yes
+fun main(args: Array<String?>) { // no
 }

idea/testData/run/MainInTest/module/src/mainNullableArgsInArray_before.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: -AllowNullableArrayArgsInMain
 
 fun main(args: Array<String?>) { // no
 }

idea/testData/run/MainInTest/module/src/mainNullableArgsNullableArray_after.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +AllowNullableArrayArgsInMain
 
-fun main(args: Array<String?>?) { // yes
+fun main(args: Array<String?>?) { // no
 }

idea/testData/run/MainInTest/module/src/mainNullableArgsNullableArray_before.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: -AllowNullableArrayArgsInMain
 
 fun main(args: Array<String?>?) { // no
 }