fix(lints): unnecessary_string_escapes and prefer_function_declarations_over_variables rules

[Neha62-lit]

Refer #149

Fix lint rules:

• unnecessary_string_escapes
• prefer_function_declarations_over_variables

[Neha62-lit]

@manjotsidhu, Review this PR!

[manjotsidhu]

Ignoring the rule might not be the best thing to do here. The rule says if you want to make functions then prefer proper declarations instead of creating variables. More info: https://dart-lang.github.io/linter/lints/prefer_function_declarations_over_variables.html

In our case we can simply avoid creating the variable for function since we just have 1 usage of that variable and instead we will simply use the function implementation where we need it.

Example,
From :

 var _forgotPasswordImagePredicate =
  (Widget widget) => widget is Image && widget.height == 300;

expect(find.byWidgetPredicate(_forgotPasswordImagePredicate),
          findsOneWidget);

To:

expect(find.byWidgetPredicate((Widget widget) => widget is Image && widget.height == 300),
          findsOneWidget);

(needs formatting)

[Neha62-lit]

Okay,I Will do that.
Thank you!

[coveralls]

Pull Request Test Coverage Report for Build 1342827371

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 73.555%

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Totals
Change from base Build 1342332513:	0.0%
Covered Lines:	3855
Relevant Lines:	5241

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💛 - Coveralls

[manjotsidhu]

LGTM 👍