Fix compile errors (incompatible types)

[electron93]

Fixes the following compilation errors:

org/spongepowered/common/mixin/core/entity/EntityMixin.java:845: error: incompatible types: CAP#1 cannot be converted to int
                    .map(o -> (int) o)
                                    ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object from capture of ?
org/spongepowered/common/mixin/core/entity/EntityMixin.java:846: error: incompatible types: Object cannot be converted to int
                    .orElse(0);
                           ^
org/spongepowered/common/mixin/core/entity/EntityMixin.java:919: error: incompatible types: CAP#1 cannot be converted to int
                    .map(o -> (int) o)
                                    ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object from capture of ?
org/spongepowered/common/mixin/core/entity/EntityMixin.java:920: error: incompatible types: Object cannot be converted to int
                    .orElse(this.fire); // Otherwise, if it's failed, just "set it back"
                           ^