Remove mod function deprecation tests

#KT-26654

idea/testData/quickfix/deprecatedSymbolUsage/replaceModToRem.kt

@@ -1,5 +0,0 @@
-// "Replace with 'rem(other)'" "true"
-
-fun test() {
-    1.<caret>mod(3)
-}

idea/testData/quickfix/deprecatedSymbolUsage/replaceModToRem.kt.after

@@ -1,5 +0,0 @@
-// "Replace with 'rem(other)'" "true"
-
-fun test() {
-    1.rem(3)
-}