Revert "Provide quickfix for specifying type of variable initialized with null"

This reverts commit cdf7f46c

idea/testData/quickfix/typeMismatch/variableInitializedWithNull.kt

@@ -1,7 +0,0 @@
-// "Change type of 'x' to 'String?'" "true"
-fun foo(condition: Boolean) {
-    var x = null
-    if (condition) {
-        x = "abc"<caret>
-    }
-}

idea/testData/quickfix/typeMismatch/variableInitializedWithNull.kt.after

@@ -1,7 +0,0 @@
-// "Change type of 'x' to 'String?'" "true"
-fun foo(condition: Boolean) {
-    var x: String? = null
-    if (condition) {
-        x = "abc"
-    }
-}

idea/testData/quickfix/typeMismatch/variableInitializedWithNull2.kt

@@ -1,12 +0,0 @@
-// "Change type of 'x' to 'String?'" "false"
-// ACTION: Remove braces from 'if' statement
-// ACTION: To raw string literal
-// ACTION: Convert assignment to assignment expression
-// ERROR: Type mismatch: inferred type is String but Nothing? was expected
-// ERROR: Val cannot be reassigned
-fun foo(condition: Boolean) {
-    val x = null
-    if (condition) {
-        x = "abc"<caret>
-    }
-}

idea/testData/quickfix/typeMismatch/variableInitializedWithNull3.kt

@@ -1,11 +0,0 @@
-// "Change type of 'x' to 'String?'" "false"
-// ACTION: Remove braces from 'if' statement
-// ACTION: To raw string literal
-// ACTION: Convert assignment to assignment expression
-// ERROR: Type mismatch: inferred type is String but Int? was expected
-fun foo(condition: Boolean) {
-    var x: Int? = null
-    if (condition) {
-        x = "abc"<caret>
-    }
-}

idea/testData/quickfix/typeMismatch/variableInitializedWithNull4.kt

@@ -1,11 +0,0 @@
-// "Change type of 'x' to 'String?'" "false"
-// ACTION: Remove braces from 'if' statement
-// ACTION: To raw string literal
-// ACTION: Convert assignment to assignment expression
-// ERROR: Type mismatch: inferred type is String but Int was expected
-fun foo(condition: Boolean) {
-    var x = 1
-    if (condition) {
-        x = "abc"<caret>
-    }
-}